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A146007 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 3X3 tee 1,1 1,2 1,3 2,2 3,2 in any orientation. 0
1, 1, 3, 1, 7, 1, 130, 91, 6332, 1793, 406187, 49449, 61263393, 8852445, 32470148409, 4239917884, 39617903461163, 3145168364391, 99051976325369286, 5582755445095006, 631563332322873981680, 29889178997259704973 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.1.0.0.0.0.0.0.1

.1.1.1.0.0.1.1.1

.1.0.0.0.0.0.0.1

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.1.0.0.0.0.0.0.1

.1.1.1.0.0.1.1.1

.1.0.0.0.0.0.0.1

CROSSREFS

Sequence in context: A146281 A146265 A146217 * A061782 A074625 A284877

Adjacent sequences:  A146004 A146005 A146006 * A146008 A146009 A146010

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 26 2008

STATUS

approved

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Last modified November 17 03:06 EST 2019. Contains 329216 sequences. (Running on oeis4.)