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A146787 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1100-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 5, 11, 21, 39, 105, 351, 1205, 4629, 16631, 70563, 335933, 1961161, 12194507, 84627809, 599408761 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.1.1.0

.0.0.0.1.1.0.0.1

.0.0.0.0.1.0.0.1

.1.1.0.0.0.1.1.1

.1.1.1.0.0.0.1.1

.1.0.0.1.0.0.0.0

.1.0.0.1.1.0.0.0

.0.1.1.1.1.0.0.0

CROSSREFS

Sequence in context: A298342 A293317 A230097 * A147243 A192664 A122997

Adjacent sequences:  A146784 A146785 A146786 * A146788 A146789 A146790

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified November 27 04:21 EST 2020. Contains 338677 sequences. (Running on oeis4.)