OFFSET
0,2
COMMENTS
Also the coefficient of x^(3*n) in the expansion of Product_{k>=0} (1 + x^(3^k))^(3^k).
EXAMPLE
Product_{k>=0} (1 + x^(3^k))^(3^k) = 1 + x + 3*x^3 + 3*x^4 + 3*x^6 + 3*x^7 + 10*x^9 + 10*x^10 + 27*x^12 + 27*x^13 + 27*x^15 + 27*x^16 + 45*x^18 + 45*x^19 + ... .
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Nov 07 2018
STATUS
approved