OFFSET
0,3
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..1000
FORMULA
G.f. A(x) satisfies: A(x) = 1 / (1 - x * (1 + x) * A(x^2)). - Ilya Gutkovskiy, Nov 15 2021
a(n) ~ c * d^n, where d = 2.096382783759695271747034891835844892559952962948180418542044889824924... and c = 0.413348184087944400305975399220165744000861336139702047444087822224828... - Vaclav Kotesovec, Nov 16 2021
MATHEMATICA
f[l_List] := Block[{n = Length[l] - 1}, Append[l, Sum[l[[n - k + 1]]*l[[Floor[k/2] + 1]], {k, 0, n}]]]; Nest[f, {1}, 33] (* Ray Chandler, Feb 13 2007 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Leroy Quet, Jan 23 2007
EXTENSIONS
Extended by Ray Chandler, Feb 13 2007
STATUS
approved