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A146371 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-1111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 13, 25, 41, 95, 287, 1007, 4035, 15127, 64629, 303257, 1705229, 10297463, 68501897, 489679427, 4005352321, 35909136431, 368495419925, 4031093827951, 49953339711585 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.1.0.0.0.0.1.0

.1.1.0.0.1.1.1.1

.0.1.1.0.0.1.0.0

.0.1.0.0.0.0.0.0

.0.0.0.0.0.0.1.0

.0.0.1.0.0.1.1.0

.1.1.1.1.0.0.1.1

.0.1.0.0.0.0.1.0

CROSSREFS

Sequence in context: A261599 A144826 A030552 * A146379 A056714 A120074

Adjacent sequences:  A146368 A146369 A146370 * A146372 A146373 A146374

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified December 8 00:04 EST 2021. Contains 349590 sequences. (Running on oeis4.)