A146444 - OEIS

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A146444

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0100-0111 pattern in any orientation.

1, 1, 1, 1, 5, 17, 61, 319, 1657, 10301, 78887, 808895, 10915803, 187729525, 3870401483

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,5

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.1.1.0

.1.0.0.0.0.0.1.0

.1.0.0.0.0.0.1.1

.1.1.1.0.0.1.0.0

.0.0.1.0.0.1.1.1

.1.1.0.0.0.0.0.1

.0.1.0.0.0.0.0.1

.0.1.1.1.0.0.0.0

CROSSREFS

Sequence in context: A273327 A273836 A273704 * A128073 A051736 A301560

Adjacent sequences: A146441 A146442 A146443 * A146445 A146446 A146447

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved