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 A227673 Number of lattice paths from {n}^n to {0}^n using steps that decrement one component by 1 such that for each point (p_1,p_2,...,p_n) we have abs(p_{i}-p_{i+1}) <= 1. 1
 1, 1, 4, 320, 1281696, 482913033152, 27297846037161958056, 337320253484345016223956919936, 1248760044848501400078426452469652899962528, 1817025580455577353700768095528219275036151622984555026720 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS EXAMPLE a(0) = 1: () . a(1) = 1: (1)-(0) . .               (1,2)       (0,1) .              /     \     /     \ a(2) = 4: (2,2)       (1,1)       (0,0) . .              \     /     \     / .               (2,1)       (1,0) CROSSREFS Main diagonal of A227655. Sequence in context: A280792 A027512 A153220 * A203479 A034226 A186163 Adjacent sequences:  A227670 A227671 A227672 * A227674 A227675 A227676 KEYWORD nonn AUTHOR Alois P. Heinz, Jul 19 2013 STATUS approved

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Last modified October 17 05:23 EDT 2018. Contains 316275 sequences. (Running on oeis4.)