A235973 - OEIS

A235973

Number of (n+1) X (n+1) 0..2 arrays with the upper median equal to the lower median in every 2 X 2 subblock.

39, 1473, 143183, 46727365, 45610599689, 147068094657177, 1487588729246707713, 48486777403751460298381, 5004721415407427603880128041

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OFFSET

1,1

COMMENTS

Diagonal of A235981.

LINKS

EXAMPLE

Some solutions for n=3

..1..0..1..1....0..0..2..1....0..0..0..1....0..2..1..2....0..1..2..2

..1..1..1..2....0..1..1..1....2..0..1..1....1..1..1..1....0..0..1..2

..0..2..0..1....0..0..1..0....1..1..1..2....1..0..1..1....0..1..1..1

..1..1..1..2....1..0..0..0....2..1..1..0....1..1..1..1....1..2..0..2

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 17 2014

STATUS

approved