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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
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Jul 19 2013
STATUS
approved

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Last modified February 22 21:30 EST 2024. Contains 370265 sequences. (Running on oeis4.)