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A146939 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1111-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 8, 13, 24, 41, 98, 229, 673, 1711, 5548, 16018, 61606, 212821, 953199, 3714584, 18906725, 85353129, 504635142, 2652064148, 18219772927, 110274034707, 872419840249, 6103743292627, 55838534314788 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..30.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.1.1.1.0.0

.0.0.1.1.1.1.0.0

.1.1.0.0.0.0.1.1

.1.1.0.0.0.0.1.1

.1.1.0.0.0.0.1.1

.1.1.0.0.0.0.1.1

.0.0.1.1.1.1.0.0

.0.0.1.1.1.1.0.0

CROSSREFS

Sequence in context: A185954 A051838 A076792 * A181540 A059028 A066809

Adjacent sequences:  A146936 A146937 A146938 * A146940 A146941 A146942

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified March 21 01:18 EDT 2019. Contains 321356 sequences. (Running on oeis4.)