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A146152 Number of n X n binary arrays with all ones connected only either as two by three or three by two blocks. 0
1, 1, 5, 13, 47, 375, 3972, 47068, 892007, 26215027, 1025956370, 55524872121, 4474246357794, 516153334755405, 83220252331733856, 19182699863712254411 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

Maximal 8 X 8 example

.1.1.1.0.0.1.1.1

.1.1.1.0.0.1.1.1

.0.0.0.0.0.0.0.0

.1.1.1.0.0.1.1.1

.1.1.1.0.0.1.1.1

.0.0.0.0.0.0.0.0

.0.1.1.1.0.1.1.1

.0.1.1.1.0.1.1.1

CROSSREFS

Sequence in context: A162563 A250133 A025545 * A082132 A220900 A138277

Adjacent sequences:  A146149 A146150 A146151 * A146153 A146154 A146155

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 27 2008

STATUS

approved

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Last modified October 15 00:14 EDT 2019. Contains 328025 sequences. (Running on oeis4.)