A225220 Number of lattice paths without interior points from {n}^4 to {0}^4 using steps that decrement one component by 1.

1, 24, 1944, 132000, 8059800, 471369024, 27141228576, 1557898303104, 89658680843160, 5186780199744000, 301901643282754944, 17682835350047107968, 1041936263500353390624, 61736371470508652400000, 3676501723843796568912000, 219941299213693627194432000

Offset: 0

Author

Alois P. Heinz, May 02 2013

Keywords

• nonn

Comments

An interior point p = (p_1, ..., p_4) has 4 components with 0

Links

• Alois P. Heinz, Table of n, a(n) for n = 0..100

Crossrefs

Column k=4 of A225094.

Programs

Maple

b:= proc(n, l) b(n, l):= `if`(l[4]=0, 1, `if`(l[1]>0 and l[4] b(n, [n$4]):
seq(a(n), n=0..20);

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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