id:A146139 - OEIS Search Results

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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 5-point barb 1,1 1,2 2,2 2,3 3,2 in any orientation.

+0
1

1, 1, 1, 1, 7, 21, 61, 403, 3415, 36395, 473261, 8291363, 204964495, 6738662861, 291876652529, 16526293766701, 1250870357604441, 127503882340930419, 17331789387120484429, 3122597067315836972733, 746394914944854757141353 (list; graph; listen)

	OFFSET	`1,5`
	EXAMPLE	`Maximal 8 X 8 example` `.0.0.1.1.0.1.1.0` `.0.0.0.1.1.0.1.1` `.1.0.0.1.0.0.1.0` `.1.1.1.0.0.0.0.1` `.0.1.0.0.0.1.1.1` `.1.0.0.0.1.0.1.0` `.1.1.1.0.1.1.0.0` `.0.1.0.1.1.0.0.0`
	CROSSREFS	`Sequence in context: A146464 A001354 A088656 this_sequence A083596 A005032 A082541` `Adjacent sequences: A146136 A146137 A146138 this_sequence A146140 A146141 A146142`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 27 2008`

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

AT&T Labs Research