A146734 - OEIS

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A146734

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1110-0111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 33, 65, 207, 775, 3377, 13307, 53409, 249201, 1453605, 9533963, 70032903, 523853865, 4420682653

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,8

LINKS

Table of n, a(n) for n=1..23.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.1.0.0

.0.0.1.1.1.0.0.0

.0.1.0.0.1.0.0.1

.1.1.0.0.0.1.1.1

.1.1.1.0.0.0.1.1

.1.0.0.1.0.0.1.0

.0.0.0.1.1.1.0.0

.0.0.1.1.1.0.0.0

CROSSREFS

Sequence in context: A146710 A146803 A146702 * A146614 A146670 A146409

Adjacent sequences: A146731 A146732 A146733 * A146735 A146736 A146737

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved