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A146476 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1110-0111 pattern in any orientation. 0
1, 1, 1, 5, 9, 21, 67, 487, 1541, 16797, 92947, 1357947, 11628507, 269865307, 3412847085, 120253566545 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

Maximal 8 X 8 example

.1.1.1.0.1.1.1.0

.0.1.1.1.0.1.1.1

.0.0.0.0.0.0.0.0

.0.1.1.1.0.1.1.1

.1.1.1.0.1.1.1.0

.0.0.0.0.0.0.0.0

.1.1.1.0.1.1.1.0

.0.1.1.1.0.1.1.1

CROSSREFS

Sequence in context: A050559 A082676 A146932 * A110200 A063404 A102177

Adjacent sequences:  A146473 A146474 A146475 * A146477 A146478 A146479

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified August 21 19:04 EDT 2019. Contains 326168 sequences. (Running on oeis4.)