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A252936 Number of nX6 nonnegative integer arrays with upper left 0 and every value within 3 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 1
26, 176, 1343, 10920, 86488, 578342, 2952734, 11219797, 32649081, 76641323, 153453179, 273544411, 447399739, 685504923, 998345723, 1396407899, 1890177211, 2490139419, 3206780283, 4050585563, 5032041019, 6161632411, 7449845499 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A252938

LINKS

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

FORMULA

Empirical: a(n) = (5242880/3)*n^3 - 36032512*n^2 + (765093664/3)*n - 618047397 for n>10

EXAMPLE

Some solutions for n=4

..0..0..0..1..1..2....0..1..2..2..2..2....0..1..2..2..2..2....0..1..1..1..1..2

..0..0..0..1..2..2....0..1..2..2..3..3....1..1..2..3..3..3....0..1..1..1..2..2

..0..1..1..1..2..2....1..1..2..2..3..4....1..2..2..3..3..3....0..1..1..1..2..3

..1..1..1..1..2..2....2..2..2..3..3..4....2..2..3..3..3..3....0..1..2..2..2..3

CROSSREFS

Sequence in context: A126494 A027001 A173893 * A218083 A042312 A181342

Adjacent sequences:  A252933 A252934 A252935 * A252937 A252938 A252939

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 24 2014

STATUS

approved

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Last modified April 3 13:32 EDT 2020. Contains 333197 sequences. (Running on oeis4.)