id:A145931 - OEIS Search Results

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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a tee 1,1 1,2 1,3 2,2 in any orientation.

+0
1

1, 1, 1, 1, 4, 7, 22, 31, 166, 409, 2848, 8224, 74341, 301687, 3626272, 18878730, 299451324, 2103168465, 44919780098, 414592933018, 11582335727655, 142171297585053, 5323365939866750, 86576879487536418, 4274960797178964894 (list; graph; listen)

	OFFSET	`1,5`
	EXAMPLE	`Maximal 8 X 8 example` `.1.0.0.1.0.1.1.1` `.1.1.0.1.1.0.1.0` `.1.0.0.1.0.0.0.0` `.0.1.0.0.0.1.1.1` `.1.1.1.0.0.0.1.0` `.0.0.0.0.1.0.0.1` `.0.1.0.1.1.0.1.1` `.1.1.1.0.1.0.0.1`
	CROSSREFS	`Sequence in context: A039959 A010363 A119561 this_sequence A026548 A127361 A100098` `Adjacent sequences: A145928 A145929 A145930 this_sequence A145932 A145933 A145934`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 25 2008`

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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.

AT&T Labs Research