A252682 Number of (3+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

808, 991, 2106, 3424, 9794, 24666, 42376, 125832, 326768, 565518, 1698816, 4451760, 7722912, 23328330, 61391478, 106584670, 322954248, 852076548, 1479906686, 4493335028, 11876176592, 20631760216, 62734685478, 166027399194

Offset

1,1

Comments

Row 3 of A252679

Links

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

Formula

Empirical: a(n) = 32*a(n-3) -343*a(n-6) +1404*a(n-9) -1602*a(n-12) -3076*a(n-15) +8151*a(n-18) -2122*a(n-21) -7989*a(n-24) +5794*a(n-27) +1592*a(n-30) -2032*a(n-33) +192*a(n-36) for n>39

Example

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

Crossrefs

Sequence in context: A252516 A252523 A243858 * A235093 A259959 A332180

Adjacent sequences: A252679 A252680 A252681 * A252683 A252684 A252685

Keyword

nonn

Author

R. H. Hardin, Dec 20 2014

Status

approved