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A146154 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only either as two by three or three by two blocks. 0
1, 1, 1, 1, 3, 1, 10, 10, 43, 65, 310, 319, 2668, 3017, 34910, 54223, 689528, 1137739, 18655423, 31210424, 700220638, 1365782613, 38696080322, 86209219516, 3066770236798, 7328473794260, 340900040830525, 897917903090606 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..28.

EXAMPLE

Maximal 8 X 8 example

.1.1.0.1.1.0.1.1

.1.1.0.1.1.0.1.1

.1.1.0.1.1.0.1.1

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.1.1.0.1.1.0.1.1

.1.1.0.1.1.0.1.1

.1.1.0.1.1.0.1.1

CROSSREFS

Sequence in context: A185419 A252501 A281000 * A068438 A064060 A176740

Adjacent sequences:  A146151 A146152 A146153 * A146155 A146156 A146157

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 27 2008

STATUS

approved

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Last modified February 19 20:17 EST 2019. Contains 320328 sequences. (Running on oeis4.)