A252681 Number of (2+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 2 5 6 or 7

750, 630, 1005, 1525, 3185, 6645, 10933, 24685, 54782, 91577, 211344, 479362, 805863, 1878870, 4316287, 7281075, 17071625, 39565761, 66917777, 157482493, 367387630, 622655713, 1469264172, 3444892538, 5848122279, 13827395422

Offset

1,1

Comments

Row 2 of A252679

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 24*a(n-3) -203*a(n-6) +722*a(n-9) -959*a(n-12) -64*a(n-15) +1043*a(n-18) -682*a(n-21) +120*a(n-24) for n>33

Example

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

Crossrefs

Sequence in context: A078549 A252524 A252525 * A252532 A252533 A031968

Adjacent sequences: A252678 A252679 A252680 * A252682 A252683 A252684

Keyword

nonn

Author

R. H. Hardin, Dec 20 2014

Status

approved