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A146435 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 101-111-101 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 7, 15, 21, 45, 85, 217, 491, 1576, 4887, 18646, 57135, 229742, 795595, 3741694, 15529847, 86241543, 433623155, 2850108871, 16134076143, 119392023601, 762153190955, 6488172864617 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..29.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.1.1.0

.1.0.1.0.0.1.0.0

.1.1.1.0.1.1.1.0

.1.0.1.0.0.0.0.0

.0.0.0.0.0.1.0.1

.0.1.1.1.0.1.1.1

.0.0.1.0.0.1.0.1

.0.1.1.1.0.0.0.0

CROSSREFS

Sequence in context: A139208 A324727 A320026 * A046932 A015821 A229527

Adjacent sequences:  A146432 A146433 A146434 * A146436 A146437 A146438

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified November 20 02:34 EST 2019. Contains 329323 sequences. (Running on oeis4.)