A252436 Number of (3+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 2 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 2 4 6 or 7

608, 914, 1810, 2971, 8430, 20632, 38186, 110958, 272407, 510414, 1490930, 3664553, 6914665, 20282902, 49839127, 94540437, 278222976, 683492339, 1301963425, 3841419150, 9435178209, 18031752713, 53308972034, 130916661611, 250833053261

Offset

1,1

Comments

Row 3 of A252433

Links

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

Formula

Empirical: a(n) = 26*a(n-3) -179*a(n-6) +122*a(n-9) +562*a(n-12) -680*a(n-15) -425*a(n-18) +768*a(n-21) +19*a(n-24) -236*a(n-27) +24*a(n-30) for n>34

Example

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

Crossrefs

Sequence in context: A096525 A142554 A345875 * A179247 A172344 A187421

Adjacent sequences: A252433 A252434 A252435 * A252437 A252438 A252439

Keyword

nonn

Author

R. H. Hardin, Dec 17 2014

Status

approved