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A146144 Number of n X n binary arrays with all ones connected only in an em 1,1 1,2 2,2 2,3 3,3 in any orientation. 0
1, 1, 5, 19, 97, 863, 18767, 490889, 19713443, 1413873475, 167866752937, 30662833126025, 9066289386941209 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Maximal 8 X 8 example

.0.1.1.0.0.0.1.1

.1.0.1.1.0.1.1.0

.1.1.0.1.0.1.0.1

.0.1.1.0.0.0.1.1

.0.0.0.0.0.1.1.0

.0.1.1.0.1.0.0.1

.1.1.0.1.1.0.1.1

.1.0.1.1.0.1.1.0

CROSSREFS

Sequence in context: A020050 A106958 A331336 * A162292 A321875 A005165

Adjacent sequences:  A146141 A146142 A146143 * A146145 A146146 A146147

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 27 2008

STATUS

approved

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Last modified April 5 13:26 EDT 2020. Contains 333241 sequences. (Running on oeis4.)