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A055828
a(n) = T(2n+4,n), array T as in A055818.
8
1, 47, 336, 2128, 12848, 75808, 441824, 2557024, 14737312, 84726992, 486388912, 2789840688, 15995087184, 91689974592, 525608606912, 3013422222272, 17280193763392, 99117586397296, 568696489153808, 3263973649089808
OFFSET
0,2
LINKS
MAPLE
T:= proc(i, j) option remember;
if i=0 or j=0 then 1
else add(add(T(h, m), m=0..j), h=0..i-1)
fi; end:
seq(T(n+4, n), n=0..30); # G. C. Greubel, Jan 22 2020
MATHEMATICA
T[i_, j_]:= T[i, j]= If[i==0 || j==0, 1, Sum[T[h, m], {h, 0, i-1}, {m, 0, j}]]; Table[T[n+4, n], {n, 0, 25}] (* G. C. Greubel, Jan 22 2020 *)
PROG
(Sage)
@CachedFunction
def T(i, j):
if (i==0 or j==0): return 1
else: return sum(sum(T(h, m) for m in (0..j)) for h in (0..i-1))
[T(n+4, n) for n in (0..30)] # G. C. Greubel, Jan 22 2020
KEYWORD
nonn
AUTHOR
Clark Kimberling, May 28 2000
STATUS
approved