OFFSET
0,3
FORMULA
Conjecture: a(n) = Sum_{k=1..n} A126198(n,k), for n > 0. - L. Edson Jeffery, Nov 29 2013
EXAMPLE
a(0)=1, a(1)=0+1=1, a(2)=0+1+2=3, a(3)=0+1+3+4=8.
MATHEMATICA
f[ n_, m_ ] := f[ n, m ]=Which[ n>0, Sum[ f[ n-i, m ], {i, 1, m} ], n<0, 0, n==0, 1 ] Table[ Sum[ f[ n, j ], {j, 0, n} ], {n, 0, 30} ]
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Richard L. Ollerton and Eirwyn L. Ollerton
STATUS
approved