A252106 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 2 3 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 2 3 6 or 7

1417, 1424, 554, 1314, 3528, 9834, 33216, 252160, 1017408, 4251648, 95453184, 461119488, 2176843776, 165104582656, 884163477504, 4458176053248, 1236435185172480, 6998537539682304, 36521378228207616

Offset

1,1

Comments

Diagonal of A252114

Links

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

Example

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

Crossrefs

Sequence in context: A207046 A237220 A188099 * A252107 A252114 A364125

Adjacent sequences: A252103 A252104 A252105 * A252107 A252108 A252109

Keyword

nonn

Author

R. H. Hardin, Dec 14 2014

Status

approved