A123786 - OEIS

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A123786

Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 5.

0

1, 18, 952, 60878, 4319328, 325354277, 25539764546, 2066227060325

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

OFFSET

1,2

LINKS

Table of n, a(n) for n=1..8.

CROSSREFS

Cf. A112389, A123762 - A123827, A123829 - A123849.

Sequence in context: A242446 A160013 A356687 * A333089 A129009 A042409

Adjacent sequences: A123783 A123784 A123785 * A123787 A123788 A123789

KEYWORD

nonn,hard,changed

AUTHOR

Søren Eilers, Oct 29 2006

STATUS

approved