Voozh

VOOZH

URL: https://oeis.org/A144059

⇱ A144059 - OEIS

login

A144059

Number of n X n binary arrays, symmetric under 180 degree rotation, with every 1 adjacent to at least one other 1, but at most one 1 adjacent horizontally and at most one 1 adjacent vertically.

0

1, 2, 7, 43, 317, 4395, 85883, 3189035, 155707292, 14992855085, 1844750664909, 446183107764907, 140966932321586720

(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: A146759 A303031 A220220 * A352293 A078676 A265229

Adjacent sequences: A144056 A144057 A144058 * A144060 A144061 A144062

KEYWORD

nonn

AUTHOR

R. H. Hardin, Sep 08 2008

STATUS

approved