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Search: id:A145775
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A145775 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only either two adjacent vertically or two adjacent horizontally. +0
1
1, 1, 1, 4, 10, 25, 98, 304, 1809, 7930, 72506, 400613, 5713422, 40142648, 888016669, 8057185631, 274304468798, 3201392865337, 169069430683773, 2534673576738596, 207045671219200314, 3988243193242437962, 504059170133969414707 (list; graph; listen)
OFFSET

1,4
CROSSREFS

Sequence in context: A020734 A097136 A049348 this_sequence A001214 A022812 A000293

Adjacent sequences: A145772 A145773 A145774 this_sequence A145776 A145777 A145778

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net), Oct 18 2008

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Last modified November 25 14:49 EST 2009. Contains 167514 sequences.

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