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A203915 Number of (n+2)X(n+2) 0..1 arrays with every 3X3 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..1 introduced in row major order 0
112, 1682, 21470, 262088, 3191760, 38438912, 457030140, 5384729088, 62912016986, 730166033682, 8416701868906, 96505946204192, 1100473855059936, 12494678609945088, 141221958080796180, 1590433321339235592 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A203923

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

Some solutions for n=3

..0..1..0..1..1....0..0..1..0..0....0..1..0..0..0....0..0..1..0..0

..1..0..1..1..1....0..1..0..0..1....1..0..0..0..1....0..1..0..1..1

..0..1..1..1..0....1..0..0..1..0....0..0..0..0..0....1..0..1..0..1

..1..1..1..1..0....0..0..1..0..0....0..0..0..0..0....1..1..0..1..0

..1..0..0..1..1....0..1..1..1..0....0..1..1..0..0....0..1..1..0..0

CROSSREFS

Sequence in context: A327633 A210300 A210293 * A233884 A246895 A188153

Adjacent sequences:  A203912 A203913 A203914 * A203916 A203917 A203918

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 07 2012

STATUS

approved

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Last modified January 26 17:22 EST 2020. Contains 331280 sequences. (Running on oeis4.)