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A123803
Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1x7 which is symmetric after a rotation by 180 degrees.
0
1, 2, 52, 617, 6052, 86534, 814679, 12560687
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..8.
CROSSREFS
Cf.
A112389
,
A123762
-
A123827
,
A123829
-
A123849
.
Sequence in context:
A300104
A034311
A053317
*
A284767
A101930
A297756
Adjacent sequences:
A123800
A123801
A123802
*
A123804
A123805
A123806
KEYWORD
nonn
,
more
AUTHOR
Søren Eilers
, Oct 29 2006
STATUS
approved
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Last modified September 2 10:42 EDT 2024. Contains 375613 sequences. (Running on oeis4.)