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A146451 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0110-0011 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 11, 23, 43, 147, 439, 1275, 4541, 20063, 98055, 505355, 2950723, 18858815, 128249637, 989759495, 8490117733 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.1.1.0

.1.0.0.0.1.1.0.0

.1.1.0.1.1.0.0.0

.0.1.1.0.0.1.0.0

.0.0.1.0.0.1.1.0

.0.0.0.1.1.0.1.1

.0.0.1.1.0.0.0.1

.0.1.1.0.0.0.0.0

CROSSREFS

Sequence in context: A199848 A228444 A191235 * A195043 A029468 A198588

Adjacent sequences:  A146448 A146449 A146450 * A146452 A146453 A146454

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified November 21 11:28 EST 2018. Contains 317447 sequences. (Running on oeis4.)