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A146466 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-0111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 7, 7, 21, 21, 55, 55, 263, 263, 1645, 1645, 13423, 13423 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,13

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Maximal 13 X 13 example

.0.0.1.1.0.0.0.0.0.1.1.0.0

.0.0.0.1.1.1.0.1.1.1.0.0.0

.1.0.0.1.0.0.0.0.0.1.0.0.1

.1.1.1.0.0.0.0.0.0.0.1.1.1

.0.1.0.0.0.0.0.0.0.0.0.1.0

.0.1.0.0.0.0.0.0.0.0.0.1.0

.0.0.0.0.0.0.0.0.0.0.0.0.0

.0.1.0.0.0.0.0.0.0.0.0.1.0

.0.1.0.0.0.0.0.0.0.0.0.1.0

.1.1.1.0.0.0.0.0.0.0.1.1.1

.1.0.0.1.0.0.0.0.0.1.0.0.1

.0.0.0.1.1.1.0.1.1.1.0.0.0

.0.0.1.1.0.0.0.0.0.1.1.0.0

CROSSREFS

Sequence in context: A146711 A146402 A146410 * A146141 A062368 A283067

Adjacent sequences:  A146463 A146464 A146465 * A146467 A146468 A146469

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified September 26 12:17 EDT 2022. Contains 356997 sequences. (Running on oeis4.)