A253005 Number of n X n nonnegative integer arrays with upper left 0 and lower right its king-move distance away minus 3 and every value increasing by 0 or 1 with every step right, diagonally se or down.
0, 0, 0, 1, 250, 54219, 14697256, 5713126349, 3406380649146, 3235013673306411, 5006915703789559516, 12814921349279258614386, 54759970343589573849950696, 393147238947490609962950665584, 4762079888047633609309896734274288
Offset: 1
Keywords
Examples
Some solutions for n=6: ..0..0..0..0..0..0....0..0..0..0..0..0....0..1..1..1..1..2....0..0..1..1..1..2 ..0..0..0..0..0..1....0..0..0..1..1..1....1..1..1..1..1..2....0..0..1..1..1..2 ..0..0..1..1..1..1....0..0..0..1..1..1....1..1..1..1..1..2....0..1..1..1..2..2 ..0..0..1..1..1..2....0..0..0..1..1..2....1..1..1..1..1..2....1..1..1..2..2..2 ..0..0..1..1..1..2....0..0..0..1..1..2....1..1..1..1..1..2....1..1..1..2..2..2 ..1..1..1..1..1..2....1..1..1..1..2..2....1..2..2..2..2..2....1..1..1..2..2..2
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