id:A146053 - OEIS Search Results

Search: id:A146053

Displaying 1-1 of 1 results found.

page 1

Number of n X n binary arrays symmetric under 180 degree rotation 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, 5, 29, 139, 901, 5485, 74291, 1056181, 24810777, 651071773, 25748617719, 1169149922235, 81072042123257, 6590052771959131 (list; graph; listen)

	OFFSET	`1,4`
	EXAMPLE	`Maximal 8 X 8 example` `.1.1.0.1.0.1.1.1` `.1.1.0.1.1.0.1.1` `.1.0.0.1.1.0.0.0` `.0.1.1.0.0.1.1.1` `.1.1.1.0.0.1.1.0` `.0.0.0.1.1.0.0.1` `.1.1.0.1.1.0.1.1` `.1.1.1.0.1.0.1.1`
	CROSSREFS	`Sequence in context: A153077 A000352 A034332 this_sequence A163082 A060963 A107002` `Adjacent sequences: A146050 A146051 A146052 this_sequence A146054 A146055 A146056`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 26 2008`

page 1

Search completed in 0.002 seconds

Last modified December 11 12:57 EST 2009. Contains 170656 sequences.

AT&T Labs Research