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A146600 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1000-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 5, 19, 39, 83, 233, 711, 2313, 8511, 40097, 191977, 1081845, 6288993, 41547129, 292524045, 2387601825, 20697818111 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.1.0.0.0.0.1.1.1

.1.0.0.0.0.1.0.0

.1.1.1.1.0.1.0.0

.0.0.0.0.0.1.0.0

.0.0.1.0.0.0.0.0

.0.0.1.0.1.1.1.1

.0.0.1.0.0.0.0.1

.1.1.1.0.0.0.0.1

CROSSREFS

Sequence in context: A254060 A129828 A239831 * A262997 A031379 A125202

Adjacent sequences:  A146597 A146598 A146599 * A146601 A146602 A146603

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified February 17 02:22 EST 2020. Contains 331976 sequences. (Running on oeis4.)