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A146877 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1110-0100-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 13, 37, 65, 121, 421, 1309, 3649, 15177, 81237, 474405, 2569641, 13240801, 84039101, 586237485 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.1.0.0.0.0.1.1.1

.1.0.1.0.0.1.0.0

.1.1.1.0.1.1.1.0

.0.0.1.0.0.0.0.0

.0.0.0.0.0.1.0.0

.0.1.1.1.0.1.1.1

.0.0.1.0.0.1.0.1

.1.1.1.0.0.0.0.1

CROSSREFS

Sequence in context: A118071 A307192 A147207 * A309720 A233435 A049742

Adjacent sequences:  A146874 A146875 A146876 * A146878 A146879 A146880

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 18 04:57 EDT 2019. Contains 328145 sequences. (Running on oeis4.)