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A147430 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1010-1111-0101 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 25, 25, 89, 89, 469, 469, 5217, 5217, 82459, 82459, 1354121, 1354121, 28702995, 28702995, 915889909, 915889909 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..26.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.0.0.0.0.0

.1.0.1.0.0.0.1.0.1

.1.1.1.1.0.1.1.1.1

.0.1.0.1.0.1.0.1.0

.0.0.0.0.0.0.0.0.0

.0.1.0.1.0.1.0.1.0

.1.1.1.1.0.1.1.1.1

.1.0.1.0.0.0.1.0.1

.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A147499 A146591 A146868 * A147462 A146367 A014725

Adjacent sequences:  A147427 A147428 A147429 * A147431 A147432 A147433

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified June 29 23:00 EDT 2022. Contains 354913 sequences. (Running on oeis4.)