A252835 Number of nX7 nonnegative integer arrays with upper left 0 and every value within 2 of its king move distance from the upper left and every value increasing by 0 or 1 with every step right, diagonally se or down.
22, 125, 850, 6211, 42738, 244131, 1056756, 3320837, 7822881, 14827629, 24422839, 36628371, 51446975, 68878827, 88923927, 111582275, 136853871, 164738715, 195236807, 228348147, 264072735, 302410571, 343361655, 386925987, 433103567
Offset: 1
Keywords
Examples
Some solutions for n=4 ..0..1..2..2..3..4..4....0..1..2..2..3..4..5....0..1..1..2..3..3..4 ..0..1..2..3..3..4..5....0..1..2..2..3..4..5....0..1..1..2..3..4..4 ..1..1..2..3..3..4..5....1..1..2..2..3..4..5....1..1..2..2..3..4..5 ..2..2..2..3..3..4..5....1..1..2..3..3..4..5....2..2..2..2..3..4..5
Links
- R. H. Hardin, Table of n, a(n) for n = 1..210
Formula
Empirical: a(n) = 1306624*n^2 - 17846996*n + 62638467 for n>11
Comments