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A146060 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 2X3 U in any orientation. 0
1, 1, 1, 1, 1, 5, 15, 27, 53, 153, 487, 1719, 7415, 32545, 166197, 903303, 5463687, 37085195, 288519629, 2455679981, 24371430209, 259645240127, 3154594586943, 41721327840785, 629945561496623 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

Maximal 8 X 8 example

.1.1.0.0.0.1.0.1

.0.1.0.0.0.1.1.1

.1.1.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.1.1

.1.1.1.0.0.0.1.0

.1.0.1.0.0.0.1.1

CROSSREFS

Sequence in context: A339567 A067533 A110343 * A076843 A285406 A129393

Adjacent sequences: A146057 A146058 A146059 * A146061 A146062 A146063

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 26 2008

STATUS

approved

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Last modified March 21 13:27 EDT 2023. Contains 361402 sequences. (Running on oeis4.)