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A034186
Number of symmetric n X 4 crossword puzzle grids.
3
1, 3, 21, 47, 227, 499, 2321, 5087, 23429, 51263, 235881, 515691, 2372511, 5185609, 23856215, 52139887, 239863701, 524238555, 2411688233, 5270900439, 24248031407, 52995614649
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..22.
CROSSREFS
Cf.
A001333
,
A034184
-
A034187
.
Sequence in context:
A318549
A217000
A360316
*
A318211
A219069
A027499
Adjacent sequences:
A034183
A034184
A034185
*
A034187
A034188
A034189
KEYWORD
nonn
AUTHOR
Erich Friedman
STATUS
approved
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Last modified May 17 03:33 EDT 2024. Contains 372577 sequences. (Running on oeis4.)