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A146008 Number of n X n binary arrays symmetric under horizontal and vertical 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, 1, 1, 1, 1, 10, 5, 94, 17, 755, 53, 7939, 559, 210819, 10558, 8799077, 208889, 469946628, 6272332, 39105876330, 353563401, 5486841066288, 30617473617, 1188207651549069, 3806002157431, 391224146110279498, 753576262868027 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..28.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.0.0.1.0.0

.1.1.1.0.0.1.1.1

.0.0.1.0.0.1.0.0

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.0.1.0.0.1.0.0

.1.1.1.0.0.1.1.1

.0.0.1.0.0.1.0.0

CROSSREFS

Sequence in context: A033962 A241360 A096898 * A038307 A094260 A239603

Adjacent sequences:  A146005 A146006 A146007 * A146009 A146010 A146011

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 26 2008

STATUS

approved

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Last modified October 23 22:52 EDT 2019. Contains 328378 sequences. (Running on oeis4.)