A251027 Number of (n+1)X(7+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements

126955, 334167, 608267, 1199576, 2203974, 4230166, 7948184, 15543033, 30783775, 63428115, 133806457, 290589257, 642273542, 1441935948, 3266407237, 7449665312, 17053708629, 39139562962, 89950860174, 206910386515, 476167313927

Offset

1,1

Comments

Column 7 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=1
..0..0..0..3..0..3..0..3....0..0..3..0..1..0..2..2....0..2..0..0..3..1..2..3
..3..0..0..3..0..3..0..3....3..3..3..0..1..0..0..0....0..2..0..0..3..0..0..0

Crossrefs

Sequence in context: A230722 A251016 A349284 * A204149 A066690 A189185

Adjacent sequences: A251024 A251025 A251026 * A251028 A251029 A251030

Keyword

nonn

Author

R. H. Hardin, Nov 29 2014

Status

approved