OFFSET
4,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 4..1000
MAPLE
b:= proc(n, l, k) option remember; `if`(n=0, 1, add(`if`(
i=l, 0, add(b(n-i*j, i, k), j=1..min(k, n/i))), i=1..n))
end:
a:= n-> b(n, 0, 4) -b(n, 0, 3):
seq(a(n), n=4..50); # Alois P. Heinz, Feb 08 2017
MATHEMATICA
b[n_, l_, k_] := b[n, l, k] = If[n == 0, 1, Sum[If[i == l, 0, Sum[b[n - i*j, i, k], {j, 1, Min[k, n/i]}]], {i, 1, n}]];
a[n_] := b[n, 0, 4] - b[n, 0, 3];
Table[a[n], {n, 4, 50}] (* Jean-François Alcover, May 21 2018, after Alois P. Heinz *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Christian G. Bower, Jan 23 2004
STATUS
approved