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A123795
Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1x6 which is symmetric after a rotation by 180 degrees.
0
1, 1, 43, 289, 3796, 30757, 384465, 3363194
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OFFSET
1,3
LINKS
Table of n, a(n) for n=1..8.
CROSSREFS
Cf.
A112389
,
A123762
-
A123827
,
A123829
-
A123849
.
Sequence in context:
A231226
A268259
A140012
*
A364320
A346575
A217621
Adjacent sequences:
A123792
A123793
A123794
*
A123796
A123797
A123798
KEYWORD
nonn
AUTHOR
Søren Eilers
, Oct 29 2006
STATUS
approved
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Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)