A253521 Number of (n+1)X(5+1) 0..2 arrays with every 2X2 subblock diagonal minimum minus antidiagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal maximum nondecreasing vertically

42669, 169828, 256914, 370028, 673229, 1439791, 3429207, 8936967, 24799705, 71469938, 210239277, 624906937, 1866784570, 5589710182, 16755089278, 50247017691, 150717649463, 452123299882, 1356332753987, 4068952191477

Offset

1,1

Comments

Column 5 of A253524

Links

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

Formula

Empirical: a(n) = 9*a(n-1) -33*a(n-2) +65*a(n-3) -75*a(n-4) +51*a(n-5) -19*a(n-6) +3*a(n-7) for n>15

Example

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

Crossrefs

Sequence in context: A210264 A251245 A187959 * A254419 A254426 A147635

Adjacent sequences: A253518 A253519 A253520 * A253522 A253523 A253524

Keyword

nonn

Author

R. H. Hardin, Jan 03 2015

Status

approved