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A253222 Number of nX7 nonnegative integer arrays with upper left 0 and lower right its king-move distance away minus 2 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 1
15, 81, 504, 3140, 16028, 47698, 47698, 649712, 2913793, 7415837, 14420585, 24015795, 36221327, 51039931, 68471783, 88516883, 111175231, 136446827, 164331671, 194829763, 227941103, 263665691, 302003527, 342954611, 386518943 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A253223

LINKS

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

FORMULA

Empirical: a(n) = 1306624*n^2 - 20460244*n + 81385043 for n>12

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A266288 A213552 A060581 * A284900 A065103 A279395

Adjacent sequences:  A253219 A253220 A253221 * A253223 A253224 A253225

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 29 2014

STATUS

approved

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Last modified January 24 01:05 EST 2020. Contains 331178 sequences. (Running on oeis4.)