OFFSET
0,3
COMMENTS
See A374848 for the definition of obverse convolution and a guide to related sequences.
FORMULA
a(n) ~ n^(2*n+1) / (2^n * exp(2*n + 2 - Pi*sqrt(2*n))). - Vaclav Kotesovec, Sep 15 2024
MATHEMATICA
s[n_] := n; t[n_] := n (n + 1)/2;
u[n_] := Product[s[k] + t[n - k], {k, 0, n}]
Table[u[n], {n, 0, 20}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Sep 14 2024
STATUS
approved