A250976 Number of (n+1)X(2+1) 0..2 arrays with no 2X2 subblock having the sum of its diagonal elements less than the absolute difference of its antidiagonal elements

562, 12077, 260056, 5598430, 120515358, 2594308975, 55847243498, 1202213827627, 25879845186236, 557110868066839, 11992827527938683, 258167485773838760, 5557525992329036272, 119635883127807659650, 2575380583292401972989

Offset

1,1

Comments

Column 2 of A250982

Links

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

Formula

Empirical: a(n) = 27*a(n-1) -143*a(n-2) +623*a(n-3) -1885*a(n-4) +3219*a(n-5) -3457*a(n-6) +1819*a(n-7) +676*a(n-8) -2357*a(n-9) +2321*a(n-10) -1157*a(n-11) +271*a(n-12) -13*a(n-13) -4*a(n-14)

Example

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

Crossrefs

Sequence in context: A252345 A121508 A252344 * A209907 A232679 A135437

Adjacent sequences: A250973 A250974 A250975 * A250977 A250978 A250979

Keyword

nonn

Author

R. H. Hardin, Nov 29 2014

Status

approved