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A146385 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0110-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 2, 3, 6, 11, 18, 47, 140, 456, 1541, 4859, 19189, 88716, 477610, 2733493, 16377324, 107101430, 821473645, 7043526337, 68487711150, 704897480220, 8110505465029, 102402264000312, 1483223734585349, 23560655031075409 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.1.1.1.1.0.0

.0.1.0.1.1.0.1.0

.0.1.1.0.0.1.1.0

.0.1.1.0.0.1.1.0

.0.1.0.1.1.0.1.0

.0.0.1.1.1.1.0.0

.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A093367 A054186 A032156 * A039827 A004135 A288583

Adjacent sequences:  A146382 A146383 A146384 * A146386 A146387 A146388

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified June 17 18:57 EDT 2019. Contains 324198 sequences. (Running on oeis4.)