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A146737 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1110-0111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 17, 53, 309, 1493, 7269, 60637, 750031, 8947313, 159252711, 3162713321, 81850156841 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.1.0.0

.0.0.1.1.1.0.0.0

.0.1.0.0.1.0.0.0

.0.1.1.1.0.1.1.1

.1.1.1.0.1.1.1.0

.0.0.0.1.0.0.1.0

.0.0.0.1.1.1.0.0

.0.0.1.1.1.0.0.0

CROSSREFS

Sequence in context: A125637 A320897 A147255 * A146839 A147178 A146642

Adjacent sequences:  A146734 A146735 A146736 * A146738 A146739 A146740

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified January 19 06:18 EST 2022. Contains 350464 sequences. (Running on oeis4.)