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

1254, 1874, 3197, 8425, 29276, 112547, 446661, 1835764, 7371828, 29451572, 157491348, 667705844, 2844547668, 89546455828, 470179496916, 2340994229396

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