OFFSET
0,3
LINKS
Robert Israel, Table of n, a(n) for n = 0..2958
FORMULA
a(n) ~ c * d^n, where d = 2.17668434612191638687360948440303534082431658053308188275404767951385648... and c = 0.39120452795484998747876543545867360129596245925827624710922741574667... - Vaclav Kotesovec, Nov 16 2021
MAPLE
f:= proc(n) option remember;
add(procname(n-1-k)*procname(ceil(k/2)), k=0..n-1)
end proc:
f(0):= 1:
map(f, [$0..40]); # Robert Israel, Feb 16 2018
MATHEMATICA
f[l_List] := Block[{n = Length[l] - 1}, Append[l, Sum[l[[n - k + 1]]*l[[Ceiling[k/2] + 1]], {k, 0, n}]]]; Nest[f, {1}, 32] (* 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