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A123814 Number of ways to build a contiguous building with n LEGO blocks of size 1x8 on top of a fixed block of the same size. 0
79, 8509, 1273567, 211300931, 37827088513 (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..5.

CROSSREFS

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

Sequence in context: A038531 A032910 A116235 * A265446 A145317 A251365

Adjacent sequences:  A123811 A123812 A123813 * A123815 A123816 A123817

KEYWORD

nonn,hard

AUTHOR

Søren Eilers, Oct 29 2006

STATUS

approved

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Last modified February 21 04:18 EST 2019. Contains 320371 sequences. (Running on oeis4.)