

A252982


Number of nX7 nonnegative integer arrays with upper left 0 and lower right its kingmove distance away minus 2 and every value increasing by 0 or 1 with every step right, diagonally se or down


1



15, 145, 1836, 27905, 433401, 5672484, 60650883, 766674140, 4970634131, 18692194423, 49050683133, 101029007619, 176694157069, 276519316503, 400550856993, 548788778539, 721233081141, 917883764799, 1138740829513
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OFFSET

1,1


COMMENTS

Column 7 of A252983


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


EXAMPLE

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


CROSSREFS

Sequence in context: A206810 A025440 A155638 * A245755 A240419 A069417
Adjacent sequences: A252979 A252980 A252981 * A252983 A252984 A252985


KEYWORD

nonn


AUTHOR

R. H. Hardin, Dec 25 2014


STATUS

approved



