A251026 Number of (n+1)X(6+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements

49481, 144737, 272547, 563271, 1078862, 2160510, 4230166, 8587303, 17595371, 37245814, 80267686, 176914157, 395061425, 892649426, 2030400282, 4641838603, 10641445579, 24442851146, 56201464318, 129311654629, 297631797905

Offset

1,1

Comments

Column 6 of A251028

Links

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

Formula

Empirical: a(n) = 8*a(n-1) -25*a(n-2) +35*a(n-3) -7*a(n-4) -49*a(n-5) +77*a(n-6) -55*a(n-7) +20*a(n-8) -3*a(n-9) for n>14

Example

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

Crossrefs

Sequence in context: A251912 A251910 A235172 * A210351 A234563 A251881

Adjacent sequences: A251023 A251024 A251025 * A251027 A251028 A251029

Keyword

nonn

Author

R. H. Hardin, Nov 29 2014

Status

approved