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A144237 Number of n X n binary arrays, symmetric under horizontal reflection, with every 1 adjacent to at least one other 1 both bishopwise and rookwise but with no three 1s in a row bishopwise or rookwise. 0
1, 2, 1, 5, 12, 94, 382, 8683, 15288, 1371209, 4724300, 743433847, 5878981024, 2003707805150, 14591668576691, 15256793835289447, 136761880167895688, 342467857870682559089, 5411121863693582877434 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

CROSSREFS

Sequence in context: A049950 A095216 A174317 * A063635 A192264 A144054

Adjacent sequences:  A144234 A144235 A144236 * A144238 A144239 A144240

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net), Sep 15 2008

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Last modified February 16 23:45 EST 2012. Contains 205978 sequences.