id:A146156 - 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 either as two by three or three by two blocks.

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1

1, 1, 1, 1, 1, 1, 2, 4, 7, 11, 20, 47, 126, 349, 1026, 3169, 10962, 42335, 178967, 817710, 4108982, 22332287, 134485764, 875416554, 6255533128, 48551931040, 415466055841, 3858971189964, 39521400790374, 437870905678969 (list; graph; listen)

	OFFSET	`1,7`
	EXAMPLE	`Maximal 8 X 8 example` `.0.0.0.1.1.0.0.0` `.0.0.0.1.1.0.0.0` `.0.0.0.1.1.0.0.0` `.1.1.1.0.0.1.1.1` `.1.1.1.0.0.1.1.1` `.0.0.0.1.1.0.0.0` `.0.0.0.1.1.0.0.0` `.0.0.0.1.1.0.0.0`
	CROSSREFS	`Sequence in context: A024501 A160393 A018173 this_sequence A024927 A018077 A114347` `Adjacent sequences: A146153 A146154 A146155 this_sequence A146157 A146158 A146159`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 27 2008`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

AT&T Labs Research