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A144238 Number of n X n binary arrays, symmetric under horizontal and vertical 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, 3, 2, 6, 14, 111, 56, 1337, 718, 24951, 27864, 1478458, 1080087, 130135921, 85888038, 18349790023, 15914995870, 5514906021024, 4665956204109 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..21.

CROSSREFS

Sequence in context: A206494 A022477 A238944 * A319622 A348747 A082833

Adjacent sequences:  A144235 A144236 A144237 * A144239 A144240 A144241

KEYWORD

nonn

AUTHOR

R. H. Hardin, Sep 15 2008

STATUS

approved

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Last modified September 28 18:53 EDT 2022. Contains 357081 sequences. (Running on oeis4.)