id:A145929 - OEIS Search Results

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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a tee 1,1 1,2 1,3 2,2 in any orientation.

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1, 1, 1, 1, 2, 3, 8, 13, 44, 111, 556, 1606, 9677, 40103, 359014, 1871694, 20359902, 143317291, 2226693360, 20614186256, 404517634279, 4951846403553, 133436650402934, 2175520025174634, 76183950538555436, 1636466403191913572 (list; graph; listen)

	OFFSET	`1,5`
	EXAMPLE	`Maximal 8 X 8 example` `.0.0.0.0.0.0.0.0` `.0.0.0.1.1.1.0.0` `.0.0.0.0.1.0.1.0` `.0.1.0.0.0.1.1.0` `.0.1.1.0.0.0.1.0` `.0.1.0.1.0.0.0.0` `.0.0.1.1.1.0.0.0` `.0.0.0.0.0.0.0.0`
	CROSSREFS	`Sequence in context: A129873 A025575 A077055 this_sequence A153865 A022951 A128305` `Adjacent sequences: A145926 A145927 A145928 this_sequence A145930 A145931 A145932`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 25 2008`

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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.

AT&T Labs Research