A212927 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A212927

Number of nX5 0..4 arrays with no column j greater than column j-1 in all rows

126, 4431876, 23124921876, 85800824609376, 285912852294921876, 916111390974365234376, 2891333179750701904296876, 9071116924325493011474609376, 28391912978833403911590576171876

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 5 of A212930

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 5251*a(n-1) -7960875*a(n-2) +4411393125*a(n-3) -945536250000*a(n-4) +70667695312500*a(n-5) -1290429687500000*a(n-6) +1220703125000000*a(n-7).

Empirical: a(n) = -2*100^n-2*25^n-4*1250^n+3*500^n+3*250^n+3125^n+1. R. J. Mathar, Jun 27 2012

EXAMPLE

Some solutions for n=3

..3..1..0..2..2....3..0..1..4..2....1..1..0..4..2....0..0..3..2..1

..4..4..2..4..2....4..3..0..0..1....1..1..2..0..1....3..4..4..4..4

..4..1..1..1..0....2..4..2..3..0....4..3..4..1..2....2..1..4..1..0

CROSSREFS

Sequence in context: A078206 A025037 A281478 * A300785 A051335 A186995

Adjacent sequences: A212924 A212925 A212926 * A212928 A212929 A212930

KEYWORD

nonn

AUTHOR

R. H. Hardin May 31 2012

STATUS

approved