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A144244 Number of n X n binary arrays, symmetric under 180 degree rotation, 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, 9, 24, 94, 870, 7731, 58940, 1518701, 25116276, 780979887, 31966477480 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..13.

CROSSREFS

Sequence in context: A221756 A094633 A261060 * A079582 A259872 A320534

Adjacent sequences:  A144241 A144242 A144243 * A144245 A144246 A144247

KEYWORD

nonn

AUTHOR

R. H. Hardin, Sep 15 2008

STATUS

approved

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Last modified December 12 12:50 EST 2019. Contains 329958 sequences. (Running on oeis4.)