OFFSET
1,2
COMMENTS
Multiplicative because A163659 is. - Andrew Howroyd, Jul 27 2018
LINKS
Paul D. Hanna, Table of n, a(n) for n = 1..1000
FORMULA
L.g.f.: log(1+x+x^2) + Sum_{n>=0} 7*4^n * log(1 + x^(2*2^n) + x^(4*2^n)) = Sum_{n>=1} a(n)*x^n/n.
G.f.: x*(1+2*x)/(1+x+x^2) + Sum_{n>=0} 14*8^n * x^(2*2^n) * (1 + 2*x^(2*2^n)) / (1 + x^(2*2^n) + x^(4*2^n)).
EXAMPLE
PROG
CROSSREFS
KEYWORD
sign,mult
AUTHOR
Paul D. Hanna, May 03 2014
STATUS
approved