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A145953 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a zee 1,1 1,2 2,2 2,3 in any orientation. 0
1, 1, 1, 1, 7, 11, 159, 327, 5133, 13861, 849385, 3108015, 457381857, 2235253839, 607242639437, 3907846853149, 2764340116761305, 23642760363071615, 40211844595990066697, 457112748895519083981, 1725707575657931227023395 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.0.1.0.0.0.0.1.0

.1.1.0.0.0.0.1.1

.1.0.0.0.0.0.0.1

.0.1.0.0.0.0.1.0

.1.1.0.0.0.0.1.1

.1.0.0.0.0.0.0.1

.0.1.1.0.0.1.1.0

.1.1.0.0.0.0.1.1

CROSSREFS

Sequence in context: A057737 A130704 A038543 * A154303 A128340 A106716

Adjacent sequences:  A145950 A145951 A145952 * A145954 A145955 A145956

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 25 2008

STATUS

approved

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Last modified January 27 14:39 EST 2020. Contains 331295 sequences. (Running on oeis4.)