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A146422 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1010-1111 pattern in any orientation. 0
1, 1, 1, 1, 9, 13, 35, 63, 2283, 5585, 180293, 562375, 23209995, 88508965, 13019468881, 63861201843, 14755196146889, 90930193025577, 44655947502046605, 347179958945954717 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..20.

EXAMPLE

Maximal 8 X 8 example

.1.1.0.0.0.0.1.1

.1.0.0.0.0.0.0.1

.1.1.0.0.0.0.1.1

.1.0.0.0.0.0.0.1

.0.0.1.0.0.1.0.0

.0.1.1.0.0.1.1.0

.0.0.1.0.0.1.0.0

.0.1.1.0.0.1.1.0

CROSSREFS

Sequence in context: A287766 A146739 A146723 * A147352 A147391 A241677

Adjacent sequences:  A146419 A146420 A146421 * A146423 A146424 A146425

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified October 21 02:29 EDT 2021. Contains 348141 sequences. (Running on oeis4.)