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Search: id:A145774
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A145774 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only either two adjacent vertically or two adjacent horizontally. +0
1
1, 3, 5, 18, 124, 889, 9624, 117592, 3086899, 71342470, 3940302454, 162484045629, 19765145478158, 1482360209667114, 393627814809408705, 53489489176352337875, 30927278141339388397696, 7617052120730650394236371 (list; graph; listen)
OFFSET

1,2
CROSSREFS

Sequence in context: A011964 A123793 A022489 this_sequence A128362 A053484 A025046

Adjacent sequences: A145771 A145772 A145773 this_sequence A145775 A145776 A145777

KEYWORD

nonn

AUTHOR

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

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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