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A123790 Number of ways to build a contiguous building with n LEGO blocks of size 1x5 on top of a fixed block of the same size. 0
34, 1516, 93664, 6366476, 468438942, 36108392112, 2882260782674 (list; graph; refs; listen; history; text; internal format)
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..7.

CROSSREFS

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

Sequence in context: A093550 A296587 A212735 * A297636 A212033 A202297

Adjacent sequences:  A123787 A123788 A123789 * A123791 A123792 A123793

KEYWORD

nonn,hard

AUTHOR

Søren Eilers, Oct 29 2006

STATUS

approved

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Last modified August 17 17:59 EDT 2022. Contains 356189 sequences. (Running on oeis4.)