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A144241 Number of n X n binary arrays, symmetric about the diagonal and under 90 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, 3, 2, 4, 4, 13, 10, 65, 30, 231, 168, 1370, 1317, 17525, 10846, 191939, 133498, 2802218, 2431795, 73051050, 54458173, 2202863847, 1575946900, 84041510893, 69906212126, 5035951361562, 4061748253676, 385626222267420 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..30.

CROSSREFS

Sequence in context: A206738 A282971 A174618 * A094173 A214370 A227859

Adjacent sequences:  A144238 A144239 A144240 * A144242 A144243 A144244

KEYWORD

nonn

AUTHOR

R. H. Hardin, Sep 15 2008

STATUS

approved

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Last modified October 24 00:04 EDT 2018. Contains 316541 sequences. (Running on oeis4.)