OFFSET
0,1
COMMENTS
See A374848 for the definition of obverse convolution and a guide to related sequences.
If k>=0, then a(2k) is even and a(2k+1) is a square.
FORMULA
From Vaclav Kotesovec, Sep 13 2024: (Start)
a(n) = (3*n+4)^(n+1).
a(n) ~ exp(4/3) * 3^(n+1) * n^(n+1). (End)
MATHEMATICA
s[n_] := 3 n + 2; t[n_] := 3 n + 2;
u[n_] := Product[s[k] + t[n - k], {k, 0, n}]
Table[u[n], {n, 0, 17}]
(* or *)
Table[(3*n+4)^(n+1), {n, 0, 20}] (* Vaclav Kotesovec, Sep 13 2024 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Sep 13 2024
STATUS
approved