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A146798 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0110-0100-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 9, 49, 253, 1201, 4573, 30217, 286533, 2941009, 37746461, 678979449, 14880214645, 369497873441 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..17.

EXAMPLE

Maximal 8 X 8 example

.1.1.1.1.0.0.0.0

.0.1.0.0.0.0.0.1

.0.1.1.0.0.1.0.1

.1.0.0.0.0.1.1.1

.1.1.1.0.0.0.0.1

.1.0.1.0.0.1.1.0

.1.0.0.0.0.0.1.0

.0.0.0.0.1.1.1.1

CROSSREFS

Sequence in context: A081655 A181539 A224473 * A055428 A012231 A123270

Adjacent sequences:  A146795 A146796 A146797 * A146799 A146800 A146801

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified January 28 14:26 EST 2022. Contains 350656 sequences. (Running on oeis4.)