A146794 - OEIS

A146794

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0110-0100-1111 pattern in any orientation.

1, 1, 1, 1, 1, 5, 17, 41, 145, 657, 4553, 32425, 257569, 2670753, 36201945, 564616361, 10290347089, 235475912465, 6833463711081, 238928359316057, 9863518167137825

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OFFSET

1,6

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.1.1.1.1.0.0

.0.0.0.1.0.0.0.0

.1.0.0.1.1.0.0.1

.1.1.1.0.0.1.0.1

.1.0.1.0.0.1.1.1

.1.0.0.1.1.0.0.1

.0.0.0.0.1.0.0.0

.0.0.1.1.1.1.0.0

CROSSREFS

Sequence in context: A139562 A201599 A246636 * A146834 A130739 A147412

Adjacent sequences: A146791 A146792 A146793 * A146795 A146796 A146797

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved