A252982 Number of nX7 nonnegative integer arrays with upper left 0 and lower right its king-move distance away minus 2 and every value increasing by 0 or 1 with every step right, diagonally se or down.
15, 145, 1836, 27905, 433401, 5672484, 60650883, 766674140, 4970634131, 18692194423, 49050683133, 101029007619, 176694157069, 276519316503, 400550856993, 548788778539, 721233081141, 917883764799, 1138740829513
Offset: 1
Keywords
Examples
Some solutions for n=4 ..0..0..1..1..1..1..1....0..1..1..2..2..3..3....0..1..1..2..2..2..2 ..0..0..1..2..2..2..2....1..1..2..2..3..3..3....0..1..1..2..2..2..2 ..1..1..1..2..3..3..3....1..1..2..3..3..3..4....0..1..1..2..3..3..3 ..1..2..2..2..3..4..4....1..1..2..3..3..3..4....0..1..1..2..3..3..4
Links
- R. H. Hardin, Table of n, a(n) for n = 1..210
Formula
Empirical: a(n) = 12103190528*n^2 - 226960984822*n + 1081747760523 for n>12
Comments