id:A146050 - 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 2X2 block with tail 1,1 1,2 1,3 2,2 2,3 in any orientation.

+0
1

1, 1, 1, 1, 1, 3, 9, 19, 37, 115, 481, 2395, 10969, 57003, 371055, 2992969, 26653005, 266091447, 3019768963, 42043911685, 666291390951, 12240477419651, 251570549673017, 6156133419360705, 172490682719945137 (list; graph; listen)

	OFFSET	`1,6`
	EXAMPLE	`Maximal 8 X 8 example` `.0.0.0.0.1.1.0.0` `.0.0.0.0.1.1.0.0` `.0.0.0.0.1.0.1.1` `.0.0.0.0.0.1.1.1` `.1.1.1.0.0.0.0.0` `.1.1.0.1.0.0.0.0` `.0.0.1.1.0.0.0.0` `.0.0.1.1.0.0.0.0`
	CROSSREFS	`Sequence in context: A147158 A014540 A146694 this_sequence A147500 A115238 A005994` `Adjacent sequences: A146047 A146048 A146049 this_sequence A146051 A146052 A146053`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 26 2008`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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