id:A145971 - OEIS Search Results

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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a one by five or five by one block.

+0
1

1, 1, 1, 1, 9, 9, 54, 93, 747, 1903, 18738, 80363, 1083847, 6706491, 120203159, 1028058854 (list; graph; listen)

	OFFSET	`1,5`
	EXAMPLE	`Maximal 8 X 8 example` `.1.1.1.1.1.0.0.1` `.0.0.0.0.0.0.0.1` `.0.1.1.1.1.1.0.1` `.1.0.0.0.0.0.0.1` `.1.0.0.0.0.0.0.1` `.1.0.1.1.1.1.1.0` `.1.0.0.0.0.0.0.0` `.1.0.0.1.1.1.1.1`
	CROSSREFS	`Sequence in context: A095344 A141635 A014718 this_sequence A165830 A152018 A112296` `Adjacent sequences: A145968 A145969 A145970 this_sequence A145972 A145973 A145974`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 25 2008`

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Last modified November 24 19:42 EST 2009. Contains 167435 sequences.