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A144239 Number of n X n binary arrays, symmetric about main diagonal, 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, 3, 9, 28, 108, 984, 7649, 73052, 1440611, 30613610, 770498233, 33712608974, 1836317274474, 122794791129401, 12495584324152671, 1697400189654813806 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..17.

CROSSREFS

Sequence in context: A099079 A339831 A006797 * A320951 A139006 A338868

Adjacent sequences: A144236 A144237 A144238 * A144240 A144241 A144242

KEYWORD

nonn

AUTHOR

R. H. Hardin, Sep 15 2008

STATUS

approved

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Last modified December 1 08:58 EST 2022. Contains 358467 sequences. (Running on oeis4.)