OFFSET
0,13
FORMULA
a(n) = Sum_{r=1..floor(n/10)} Sum_{q=r..floor((n-r)/9)} Sum_{p=q..floor((n-q-r)/8)} Sum_{o=p..floor((n-p-q-r)/7)} Sum_{m=o..floor((n-o-p-q-r)/6)} Sum_{l=m..floor((n-m-o-p-q-r)/5)} Sum_{k=l..floor((n-l-m-o-p-q-r)/4)} Sum_{j=k..floor((n-k-l-m-o-p-q-r)/3)} Sum_{i=j..floor((n-j-k-l-m-o-p-q-r)/2)} i.
MATHEMATICA
Table[Total[IntegerPartitions[n, {10}][[;; , 2]]], {n, 0, 50}] (* _Harvey P. Dale_, Nov 19 2023 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
_Wesley Ivan Hurt_, Jul 13 2019
STATUS
approved