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A146044 Number of n X n binary arrays symmetric 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, 7, 15, 37, 79, 277, 1211, 6171, 28503, 152765, 945077, 7764777, 66517839, 667569119, 7061433273, 91063498499, 1300158727279, 22513920414055 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.1.0.0

.0.0.0.0.1.1.0.0

.1.1.1.1.0.1.0.0

.0.1.0.0.0.1.0.0

.0.0.1.0.0.0.1.0

.0.0.1.0.1.1.1.1

.0.0.1.1.0.0.0.0

.0.0.1.0.0.0.0.0

CROSSREFS

Sequence in context: A159792 A247606 A146837 * A048694 A041094 A042287

Adjacent sequences:  A146041 A146042 A146043 * A146045 A146046 A146047

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 26 2008

STATUS

approved

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Last modified October 20 02:09 EDT 2020. Contains 337897 sequences. (Running on oeis4.)