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 A252821 Number of n X n nonnegative integer arrays with upper left 0 and every value within 3 of its city block distance from the upper left and every value increasing by 0 or 1 with every step right or down 1
 1, 6, 81, 1920, 54376, 1679072, 55960651, 2001017650, 76084625352, 3047083917080, 127445868976818, 5528160760257164, 247294135503496534, 11357522219262644466, 533619846702969331737, 25573797311727396663076 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A252828 LINKS R. H. Hardin, Table of n, a(n) for n = 1..25 EXAMPLE Some solutions for n=4 ..0..1..2..3....0..1..1..2....0..1..1..2....0..1..2..3....0..1..2..2 ..0..1..2..3....0..1..2..3....0..1..1..2....1..2..3..4....0..1..2..2 ..1..2..3..4....1..2..3..3....0..1..2..3....2..3..3..4....1..2..3..3 ..2..3..4..5....2..2..3..4....1..2..2..3....3..4..4..5....2..3..3..3 CROSSREFS Sequence in context: A193265 A317277 A138457 * A371765 A204264 A076282 Adjacent sequences: A252818 A252819 A252820 * A252822 A252823 A252824 KEYWORD nonn AUTHOR R. H. Hardin, Dec 22 2014 STATUS approved

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Last modified August 15 04:38 EDT 2024. Contains 375172 sequences. (Running on oeis4.)