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A147364 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 01110-11111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 2, 3, 6, 9, 16, 23, 72, 173, 621, 1620, 5393, 14347, 63207, 232978, 1333190, 5780677, 34593611, 163090674, 1165840626, 6871746297 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,7
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.1.1.1.1.1.0
.0.0.0.1.1.1.0.1
.1.0.0.0.0.0.1.1
.1.1.0.0.0.0.1.1
.1.1.0.0.0.0.1.1
.1.1.0.0.0.0.0.1
.1.0.1.1.1.0.0.0
.0.1.1.1.1.1.0.0
CROSSREFS
Sequence in context: A003244 A115995 A051057 * A147227 A147063 A357640
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified March 30 04:52 EDT 2024. Contains 371289 sequences. (Running on oeis4.)