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A146235 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 110-111-001 pattern in any orientation. 0
1, 1, 1, 1, 5, 17, 37, 167, 1407, 11143, 90213, 1212859, 22145521, 452553163, 11809473343, 424547990571, 19424907241691, 1100794820702881, 80980732651220757, 7763187679043412101, 948623501056895583231 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.1.0.1.1.0

.0.0.1.1.0.0.1.1

.1.1.0.1.1.0.1.1

.1.1.1.0.0.1.0.0

.0.0.1.0.0.1.1.1

.1.0.0.1.1.0.1.1

.1.1.1.0.1.1.0.0

.0.1.1.0.1.1.0.0

CROSSREFS

Sequence in context: A147181 A146850 A146428 * A087728 A072332 A212968

Adjacent sequences:  A146232 A146233 A146234 * A146236 A146237 A146238

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified May 22 23:18 EDT 2022. Contains 353959 sequences. (Running on oeis4.)