OFFSET
0,1
COMMENTS
See A374848 for the definition of obverse convolution and a guide to related sequences. This is a divisibility sequence (see Formula).
FORMULA
a(n) ~ c * A007685(n), where c = Product_{k=0..oo} (1 + 1/binomial(2*k,k)) = 3.74782908533723753117687910314018231428739915473496578523053032212205053... - Vaclav Kotesovec, Jul 31 2024
MATHEMATICA
s[n_] := 1; t[n_] := Binomial[2 n, n];
u[n_] := Product[s[k] + t[n - k], {k, 0, n}]
Table[u[n], {n, 0, 20}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jul 31 2024
STATUS
approved