OFFSET
0,4
COMMENTS
See A374848 for the definition of obverse convolution and a guide to related sequences.
a(2k+1) is a square for k>=0.
FORMULA
a(n) ~ n^(2*n+2) / exp(2*n - Pi*(n-1)/2). - Vaclav Kotesovec, Sep 22 2024
MATHEMATICA
s[n_] := n^2 - n; t[n_] := n^2 - n;
u[n_] := Product[s[k] + t[n - k], {k, 0, n}];
Table[u[n], {n, 0, 20}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Sep 22 2024
STATUS
approved