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A252149 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 1 3 6 or 7 0
1254, 1874, 3197, 8425, 29276, 112547, 446661, 1835764, 7371828, 29451572, 157491348, 667705844, 2844547668, 89546455828, 470179496916, 2340994229396 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A252157

LINKS

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

EXAMPLE

Some solutions for n=4

..3..0..2..3..3..3....3..3..3..2..3..3....3..3..3..3..2..3....3..3..2..0..2..3

..3..2..0..2..0..2....2..0..2..0..2..0....3..2..0..2..0..2....3..2..0..2..0..3

..3..0..2..0..2..0....0..2..0..2..0..2....2..0..2..0..2..0....2..0..2..0..2..3

..3..2..0..2..0..2....2..0..2..0..2..3....3..2..0..2..0..2....0..2..0..2..0..2

..2..0..2..0..2..0....0..2..0..2..0..3....3..0..2..0..2..3....2..0..2..0..2..3

..0..2..0..2..0..3....2..0..2..3..3..3....3..2..3..3..3..3....0..2..3..3..3..3

CROSSREFS

Sequence in context: A265970 A264291 A265925 * A252157 A252150 A023068

Adjacent sequences:  A252146 A252147 A252148 * A252150 A252151 A252152

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 14 2014

STATUS

approved

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Last modified July 8 17:40 EDT 2020. Contains 335524 sequences. (Running on oeis4.)