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A145998 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 3X3 plus 2,1 2,2 2,3 1,2 3,2. 0
1, 1, 2, 1, 4, 1, 27, 10, 325, 79, 7166, 1068, 296998, 32561, 25489453, 2049805, 4199698432, 237788014, 1353419597835, 53948164143, 849049576212123, 24026619761999, 1041648115351377356, 20926733702956682 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Maximal 8 X 8 example

.0.1.0.0.0.0.1.0

.1.1.1.0.0.1.1.1

.0.1.0.0.0.0.1.0

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.1.0.0.0.0.1.0

.1.1.1.0.0.1.1.1

.0.1.0.0.0.0.1.0

CROSSREFS

Sequence in context: A229484 A080212 A186727 * A218952 A177413 A009832

Adjacent sequences:  A145995 A145996 A145997 * A145999 A146000 A146001

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 26 2008

STATUS

approved

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Last modified January 18 03:13 EST 2019. Contains 319260 sequences. (Running on oeis4.)