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A145928 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a tee 1,1 1,2 1,3 2,2 in any orientation. 0
1, 1, 1, 3, 10, 33, 134, 947, 8780, 97821, 1375312, 27712816, 754977953, 26645291289, 1208294585650, 74271003442168, 6124346294290730, 668846422203976047, 95426817845827533968, 18141398847837127162392 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,4
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.0.1.0.0.0.1
.0.0.1.1.0.0.1.1
.0.1.0.1.0.0.0.1
.1.1.1.0.1.1.1.0
.0.0.0.1.0.1.0.1
.0.0.0.1.1.0.1.1
.0.1.0.1.0.1.0.1
.1.1.1.0.1.1.1.0
CROSSREFS
Sequence in context: A024426 A326558 A149031 * A006535 A041633 A308499
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 25 2008
STATUS
approved

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Last modified May 23 20:34 EDT 2024. Contains 372765 sequences. (Running on oeis4.)