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A146835 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1001-1111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 3, 5, 15, 25, 43, 113, 451, 1305, 6863, 22081, 100557, 420517, 2802713, 14484461, 126443483 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.0.0.1.0.0

.0.0.1.1.1.1.0.0

.1.1.0.0.1.0.1.1

.0.1.0.0.0.1.1.0

.0.1.1.0.0.0.1.0

.1.1.0.1.0.0.1.1

.0.0.1.1.1.1.0.0

.0.0.1.0.0.1.0.0

CROSSREFS

Sequence in context: A053928 A146779 A146859 * A146795 A166479 A108814

Adjacent sequences:  A146832 A146833 A146834 * A146836 A146837 A146838

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified November 27 03:16 EST 2021. Contains 349345 sequences. (Running on oeis4.)