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A146158 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only either as two by three or three by two blocks. 0
1, 1, 1, 1, 1, 3, 8, 14, 23, 49, 124, 341, 1108, 3645, 13272, 50449, 210792, 970179, 4987095, 27600222, 171681370, 1133281367, 8288847384, 64922838278, 565664086802, 5311135075018, 55657682314667, 624953409635386 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.0.0.0

.0.0.0.1.1.0.0.0

.0.0.0.1.1.0.0.0

.1.1.1.0.0.1.1.1

.1.1.1.0.0.1.1.1

.0.0.0.1.1.0.0.0

.0.0.0.1.1.0.0.0

.0.0.0.1.1.0.0.0

CROSSREFS

Sequence in context: A014848 A140479 A264689 * A062354 A257644 A135940

Adjacent sequences:  A146155 A146156 A146157 * A146159 A146160 A146161

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 27 2008

STATUS

approved

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Last modified January 27 04:57 EST 2020. Contains 331291 sequences. (Running on oeis4.)