id:A145932 - 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 tee 1,1 1,2 1,3 2,2 in any orientation.

+0
1

1, 1, 1, 5, 20, 85, 428, 3123, 34838, 454719, 8335296, 187056538, 6169076015, 247329264689, 14010937295624, 978281276679416, 99281241941019762, 12290336204514423117 (list; graph; listen)

	OFFSET	`1,4`
	EXAMPLE	`Maximal 8 X 8 example` `.1.1.1.0.0.1.1.1` `.0.1.0.0.0.0.1.0` `.0.0.0.1.1.1.0.1` `.1.0.0.0.1.0.1.1` `.1.1.0.1.0.0.0.1` `.1.0.1.1.1.0.0.0` `.0.1.0.0.0.0.1.0` `.1.1.1.0.0.1.1.1`
	CROSSREFS	`Sequence in context: A152185 A152187 A045499 this_sequence A026661 A099014 A011966` `Adjacent sequences: A145929 A145930 A145931 this_sequence A145933 A145934 A145935`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Oct 25 2008`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

AT&T Labs Research