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A145935 Number of n X n binary arrays with all ones connected only in a 2X2 elbow 1,1 1,2 2,1 in any orientation. 0
1, 5, 19, 161, 4227, 156459, 12465353, 2072728127, 654619864141, 416229285287827, 526917547596105835, 1322031106068978041109, 6596380266620378636773707, 65393268733886793784592388811 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

Maximal 8 X 8 example

.1.1.0.1.1.0.1.1

.1.0.0.0.1.0.0.1

.0.0.1.1.0.1.1.0

.1.1.0.1.0.1.0.0

.1.0.1.0.1.0.1.1

.0.1.1.0.1.1.0.1

.1.0.0.1.0.0.1.0

.1.1.0.1.1.0.1.1

CROSSREFS

Sequence in context: A193287 A027269 A082790 * A024529 A106991 A102262

Adjacent sequences:  A145932 A145933 A145934 * A145936 A145937 A145938

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 25 2008

STATUS

approved

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Last modified June 23 17:11 EDT 2021. Contains 345402 sequences. (Running on oeis4.)