A123796 - OEIS

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A123796

Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 6 which is flat, i.e., with all blocks in parallel position.

0

1, 6, 79, 1138, 18057, 296884, 5022086, 86581805, 1515222912

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

OFFSET

1,2

LINKS

Table of n, a(n) for n=1..9.

CROSSREFS

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

Sequence in context: A294992 A093033 A156929 * A184553 A129524 A131237

Adjacent sequences: A123793 A123794 A123795 * A123797 A123798 A123799

KEYWORD

nonn,hard

AUTHOR

Søren Eilers, Oct 29 2006

STATUS

approved