id:A146867 - 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 1101-1111 pattern in any orientation.

+0
1

1, 1, 1, 1, 1, 1, 1, 5, 9, 21, 33, 55, 141, 887, 2729, 13023, 38545, 182567, 834697, 7193987, 40372625, 350655929 (list; graph; listen)

	OFFSET	`1,8`
	EXAMPLE	`Maximal 8 X 8 example` `.0.0.1.0.1.1.0.0` `.0.0.1.1.1.1.0.0` `.1.1.0.0.0.0.1.1` `.0.1.0.0.0.0.1.1` `.1.1.0.0.0.0.1.0` `.1.1.0.0.0.0.1.1` `.0.0.1.1.1.1.0.0` `.0.0.1.1.0.1.0.0`
	CROSSREFS	`Sequence in context: A147562 A162795 A147407 this_sequence A068481 A146827 A147018` `Adjacent sequences: A146864 A146865 A146866 this_sequence A146868 A146869 A146870`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Nov 04 2008`

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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.