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A123806 Number of ways to build a contiguous building with n LEGO blocks of size 1x7 on top of a fixed block of the same size. 0
62, 5188, 603490, 77670923, 10795814511, 1572624052679 (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..6.

CROSSREFS

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

Sequence in context: A042861 A056639 A289297 * A233340 A299826 A209905

Adjacent sequences:  A123803 A123804 A123805 * A123807 A123808 A123809

KEYWORD

nonn,hard

AUTHOR

Søren Eilers, Oct 29 2006

STATUS

approved

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Last modified July 4 11:26 EDT 2022. Contains 355075 sequences. (Running on oeis4.)