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A123811 Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1x8 which is symmetric after a rotation by 180 degrees. 0
1, 1, 73, 893, 11257, 167129, 1969619 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..7.

CROSSREFS

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

Sequence in context: A104907 A296024 A254136 * A057522 A320205 A305549

Adjacent sequences: A123808 A123809 A123810 * A123812 A123813 A123814

KEYWORD

nonn

AUTHOR

Søren Eilers, Oct 29 2006

STATUS

approved

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Last modified December 1 15:30 EST 2022. Contains 358468 sequences. (Running on oeis4.)