OFFSET
1,2
LINKS
Ray Chandler, Table of n, a(n) for n = 1..2106 (terms < 10^1000)
Steven R. Finch, Signum equations and extremal coefficients, February 7, 2009. [Cached copy, with permission of the author]
FORMULA
a(n) ~ 3^(n+1) / (2*sqrt(Pi)*n^(3/2)). - Vaclav Kotesovec, Jul 11 2018
MATHEMATICA
nmax = 28; d = {1}; a1 = {};
Do[
n0s = Table[0, {n}];
d = Join[d, n0s, n0s] + Join[n0s, d, n0s] + Join[n0s, n0s, d];
AppendTo[a1, Last[Union[d]]];
, {n, nmax}];
a1 (* Ray Chandler, Mar 26 2014 *)
PROG
(PARI) a(n)=vecmax(Vec(prod(k=1, n, 1+x^k+x^(2*k))));
vector(50, n, a(n)) \\ Joerg Arndt, Jan 31 2024
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved