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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; text; internal format)
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

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Last modified October 2 01:30 EDT 2022. Contains 357191 sequences. (Running on oeis4.)