A252545 Number of (1+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 3 4 6 or 7

478, 1048, 2532, 5608, 14824, 38780, 89048, 237360, 622168, 1429760, 3813472, 9997360, 22975424, 61297536, 160682752, 369264512, 985412096, 2582786944, 5935395968, 15842576704, 41517842176, 95410411264, 254720901504

Offset

1,1

Comments

Row 1 of A252544

Links

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

Formula

Empirical: a(n) = 34*a(n-3) +2*a(n-5) -320*a(n-6) -36*a(n-8) +512*a(n-9) +64*a(n-11) for n>15

Example

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

Crossrefs

Sequence in context: A252543 A235083 A252544 * A260204 A119129 A252542

Adjacent sequences: A252542 A252543 A252544 * A252546 A252547 A252548

Keyword

nonn

Author

R. H. Hardin, Dec 18 2014

Status

approved