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A146406 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 17, 21, 669, 1435, 18911, 48821, 1583279, 5119381, 552048095, 2284826569, 405071372171, 2114490125109, 687967929796833, 4506360355608779, 2940096330466050229, 24177384329604438229 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.1.0.0.0.0.1.0

.0.1.0.0.0.0.1.0

.1.1.0.0.0.0.1.1

.0.1.1.0.0.1.1.0

CROSSREFS

Sequence in context: A146848 A146611 A146398 * A066470 A054478 A136198

Adjacent sequences:  A146403 A146404 A146405 * A146407 A146408 A146409

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified November 26 21:07 EST 2021. Contains 349344 sequences. (Running on oeis4.)