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A147431 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1010-1111-0101 pattern in any orientation. 0
1, 1, 1, 1, 1, 3, 9, 19, 43, 151, 665, 3477, 19383, 122069, 922803, 8541115, 92856889, 1171563865, 17291558591, 299747161375, 6126738372415, 147219368035745, 4156365837186519 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,6
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.1.0.1.0
.0.0.0.0.1.1.1.1
.0.0.1.1.0.1.0.1
.0.0.0.1.1.0.0.0
.0.0.1.1.0.0.0.0
.0.0.0.1.1.0.0.0
CROSSREFS
Sequence in context: A075188 A051894 A146393 * A329145 A348377 A147334
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified June 2 06:55 EDT 2023. Contains 363081 sequences. (Running on oeis4.)