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A123774
Number of ways to build a contiguous building with n LEGO blocks of size 1x3 on top of a fixed block of the same size.
0
14, 244, 5762, 147801, 4117161, 119893930, 3616711327, 111950012510, 3536272532516
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OFFSET
1,1
COMMENTS
The base block is not counted among the n and must be the only block in the bottom layer of the building
LINKS
Table of n, a(n) for n=1..9.
CROSSREFS
Cf. A112389, A123762 - A123827, A123829 - A123849.
Sequence in context: A286882 A326651 A055477 * A074815 A280122 A051622
Adjacent sequences: A123771 A123772 A123773 * A123775 A123776 A123777
KEYWORD
nonn,hard
AUTHOR
Søren Eilers, Oct 29 2006
STATUS
approved

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Last modified November 7 04:35 EST 2024. Contains 377523 sequences.
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