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A146473 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1110-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 5, 11, 17, 47, 105, 423, 1139, 5013, 16157, 89505, 364489, 2547425, 12720065, 106893393, 655837481, 6848268559, 52044360871, 671335193705, 6279476454279, 99399530079385, 1146233917953945, 22401744159971375 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..29.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.1.1.0

.0.0.0.1.1.1.0.1

.0.0.0.0.0.0.1.1

.0.1.0.0.0.0.1.1

.1.1.0.0.0.0.1.0

.1.1.0.0.0.0.0.0

.1.0.1.1.1.0.0.0

.0.1.1.1.0.0.0.0

CROSSREFS

Sequence in context: A283064 A154622 A147251 * A282961 A165446 A167466

Adjacent sequences:  A146470 A146471 A146472 * A146474 A146475 A146476

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified December 9 05:12 EST 2021. Contains 349626 sequences. (Running on oeis4.)