A251352 Number of (n+1)X(1+1) 0..3 arrays with no 2X2 subblock having its maximum diagonal element less than the absolute difference of its antidiagonal elements

216, 2920, 39594, 536886, 7279536, 98701641, 1338276196, 18145426216, 246030290196, 3335876643796, 45230499797844, 613271511689832, 8315228633899785, 112744560795480180, 1528681476916631872

Offset

1,1

Comments

Column 1 of A251359

Links

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

Formula

Empirical: a(n) = 16*a(n-1) -40*a(n-2) +104*a(n-3) -150*a(n-4) +118*a(n-5) -48*a(n-6) +9*a(n-7)

Example

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

Crossrefs

Sequence in context: A249005 A249470 A251359 * A027364 A017235 A152241

Adjacent sequences: A251349 A251350 A251351 * A251353 A251354 A251355

Keyword

nonn

Author

R. H. Hardin, Dec 01 2014

Status

approved