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A146443 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0100-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 17, 41, 75, 189, 781, 2423, 8297, 41313, 246219, 1447691, 8722011, 58593249, 472152107, 3875447631 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.1.0.0.0.0.0.1.1

.1.1.1.0.0.0.1.0

.0.0.1.0.1.1.1.0

.0.0.1.0.0.0.0.0

.0.0.0.0.0.1.0.0

.0.1.1.1.0.1.0.0

.0.1.0.0.0.1.1.1

.1.1.0.0.0.0.0.1

CROSSREFS

Sequence in context: A138005 A166147 A028886 * A110226 A054819 A235743

Adjacent sequences:  A146440 A146441 A146442 * A146444 A146445 A146446

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified December 21 05:45 EST 2014. Contains 252296 sequences.