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A123796
Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 6 which is flat, i.e., with all blocks in parallel position.
0
1, 6, 79, 1138, 18057, 296884, 5022086, 86581805, 1515222912
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..9.
CROSSREFS
Cf.
A112389
,
A123762
-
A123827
,
A123829
-
A123849
.
Sequence in context:
A294992
A093033
A156929
*
A184553
A129524
A131237
Adjacent sequences:
A123793
A123794
A123795
*
A123797
A123798
A123799
KEYWORD
nonn
,
hard
AUTHOR
Søren Eilers
, Oct 29 2006
STATUS
approved
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Last modified March 29 09:44 EDT 2024. Contains 371268 sequences. (Running on oeis4.)