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A146423 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1010-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 29, 29, 229, 229, 1773, 1773, 39925, 39925, 1086663, 1086663, 55544427, 55544427, 4442151653, 4442151653 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

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

EXAMPLE

Maximal 9 X 9 example

.1.1.1.1.0.1.1.1.1

.1.0.1.0.0.0.1.0.1

.0.1.0.1.0.1.0.1.0

.1.1.1.1.0.1.1.1.1

.0.0.0.0.0.0.0.0.0

.1.1.1.1.0.1.1.1.1

.0.1.0.1.0.1.0.1.0

.1.0.1.0.0.0.1.0.1

.1.1.1.1.0.1.1.1.1

CROSSREFS

Sequence in context: A040813 A022363 A146226 * A146129 A146040 A146017

Adjacent sequences:  A146420 A146421 A146422 * A146424 A146425 A146426

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified October 31 00:25 EDT 2020. Contains 338095 sequences. (Running on oeis4.)