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A147382 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 10000-11100-00111-00001 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 3, 11, 25, 47, 101, 257, 681, 1819, 5437, 17747, 62109, 244571, 1025085, 4586657, 22318221 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..23.

EXAMPLE

Maximal 9 X 9 example

.1.0.0.0.0.0.0.1.1

.1.1.1.0.0.0.0.1.0

.0.0.1.1.1.0.1.1.0

.0.0.0.0.1.0.1.0.0

.0.0.1.1.0.1.1.0.0

.0.0.1.0.1.0.0.0.0

.0.1.1.0.1.1.1.0.0

.0.1.0.0.0.0.1.1.1

.1.1.0.0.0.0.0.0.1

CROSSREFS

Sequence in context: A293413 A056106 A320035 * A212971 A258440 A184634

Adjacent sequences:  A147379 A147380 A147381 * A147383 A147384 A147385

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified July 25 20:18 EDT 2021. Contains 346291 sequences. (Running on oeis4.)