A251886 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum not 2 3 6 or 7 and every diagonal and antidiagonal sum 2 3 6 or 7

1280, 1232, 556, 1316, 3530, 9836, 33218, 252162, 1017410, 4251650, 95453186, 461119490, 2176843778, 165104582658, 884163477506, 4458176053250, 1236435185172482, 6998537539682306, 36521378228207618

Offset

1,1

Comments

Diagonal of A251894

Links

Table of n, a(n) for n=1..19.

Example

Some solutions for n=4
..1..1..2..1..1..2....2..1..1..2..1..1....2..1..2..1..1..3....3..2..3..3..2..3
..3..0..1..0..0..1....1..0..0..1..0..3....3..0..1..0..0..1....3..2..3..3..2..0
..0..0..1..0..0..1....1..0..0..1..0..0....0..0..1..0..0..1....2..0..2..2..0..2
..1..1..3..1..1..2....2..1..1..3..1..1....1..1..3..1..1..3....3..2..3..3..2..3
..0..0..1..0..0..1....1..0..0..1..0..0....0..0..1..0..0..1....3..2..3..3..2..3
..0..0..1..0..3..1....1..0..0..1..0..0....0..0..1..0..0..1....2..0..2..2..1..2

Crossrefs

Sequence in context: A293923 A251890 A251889 * A234137 A160233 A251887

Adjacent sequences: A251883 A251884 A251885 * A251887 A251888 A251889

Keyword

nonn

Author

R. H. Hardin, Dec 10 2014

Status

approved