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.

1, 2, 1, 5, 12, 94, 382, 8683, 15288, 1371209, 4724300, 743433847, 5878981024, 2003707805150, 14591668576691, 15256793835289447, 136761880167895688, 342467857870682559089, 5411121863693582877434

Offset

1,2

Links

Table of n, a(n) for n=1..19.

Crossrefs

Sequence in context: A095216 A307258 A174317 * A350742 A268295 A063635

Adjacent sequences: A144234 A144235 A144236 * A144238 A144239 A144240

Keyword

nonn

Author

R. H. Hardin, Sep 15 2008

Status

approved