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A146043 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 2X4 tee 1,1 1,2 1,3 2,3 1,4 in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 5, 5, 21, 21, 83, 83, 385, 385, 2131, 2131, 24025, 24025, 318135, 318135, 5078109, 5078109, 98561015 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,11

LINKS

Table of n, a(n) for n=1..27.

EXAMPLE

Maximal 11 X 11 example

.0.0.0.0.1.0.1.0.0.0.0

.0.0.0.0.1.0.1.0.0.0.0

.0.0.0.1.1.0.1.1.0.0.0

.0.0.1.0.1.0.1.0.1.0.0

.1.1.1.1.0.0.0.1.1.1.1

.0.0.0.0.0.0.0.0.0.0.0

.1.1.1.1.0.0.0.1.1.1.1

.0.0.1.0.1.0.1.0.1.0.0

.0.0.0.1.1.0.1.1.0.0.0

.0.0.0.0.1.0.1.0.0.0.0

.0.0.0.0.1.0.1.0.0.0.0

CROSSREFS

Sequence in context: A283250 A171219 A325893 * A116400 A279810 A279750

Adjacent sequences:  A146040 A146041 A146042 * A146044 A146045 A146046

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 26 2008

STATUS

approved

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Last modified October 27 15:27 EDT 2020. Contains 338035 sequences. (Running on oeis4.)