A251486 Number of (n+1)X(3+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements less than the minimum of its antidiagonal elements

50576, 10046784, 1996407424, 396684056960, 78819515764397, 15661071542167376, 3111780313414886566, 618295855606419707392, 122852424799301062666424, 24410188232939001443671104, 4850187451303376251467769813

Offset

1,1

Comments

Column 3 of A251491

Links

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

Formula

Empirical: a(n) = 256*a(n-1) -12199*a(n-2) +163792*a(n-3) -450614*a(n-4) -999872*a(n-5) +26782853*a(n-6) -398145776*a(n-7) -1637661603*a(n-8) +5238219360*a(n-9) +12853712360*a(n-10) -27723613504*a(n-11) -38172377104*a(n-12) +34500091392*a(n-13) +70834593600*a(n-14) -41937979392*a(n-15) +11349974016*a(n-16)

Example

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

Crossrefs

Sequence in context: A302902 A317285 A253032 * A268469 A250442 A183824

Adjacent sequences: A251483 A251484 A251485 * A251487 A251488 A251489

Keyword

nonn

Author

R. H. Hardin, Dec 03 2014

Status

approved