id:A146012 - 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 3X3 tee 1,1 1,2 1,3 2,2 3,2 in any orientation.

+0
1

1, 1, 1, 1, 1, 3, 10, 21, 36, 85, 291, 923, 3735, 16127, 78677, 397086, 2338305, 14669249, 110594974, 880940226, 8350924404, 83469619311, 977221485292, 12070642055579 (list; graph; listen)

	OFFSET	`1,6`
	EXAMPLE	`Maximal 8 X 8 example` `.0.0.0.1.1.1.0.0` `.0.0.0.0.1.0.0.0` `.1.0.0.0.1.0.0.0` `.1.1.1.0.0.0.0.1` `.1.0.0.0.0.1.1.1` `.0.0.0.1.0.0.0.1` `.0.0.0.1.0.0.0.0` `.0.0.1.1.1.0.0.0`
	CROSSREFS	`Sequence in context: A004194 A097590 A014105 this_sequence A027917 A038347 A117495` `Adjacent sequences: A146009 A146010 A146011 this_sequence A146013 A146014 A146015`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 26 2008`

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Last modified December 21 10:15 EST 2009. Contains 171081 sequences.

AT&T Labs Research