A252399 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 2 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 2 3 4 6 or 7

458, 442, 1515, 6231, 73925, 1068295, 8765249, 335814585, 13694498100, 187357176355, 23527700483260, 2773482863248050, 59943048895785363, 25273086428741548965, 8681532608051019527627, 286961563672031753409771

Offset

1,1

Comments

Diagonal of A252407

Links

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

Example

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

Crossrefs

Sequence in context: A093058 A201257 A252400 * A341186 A252407 A252408

Adjacent sequences: A252396 A252397 A252398 * A252400 A252401 A252402

Keyword

nonn

Author

R. H. Hardin, Dec 17 2014

Status

approved