OFFSET
1,2
LINKS
Martin Klazar, What is an answer? — remarks, results and problems on PIO formulas in combinatorial enumeration, part I, arXiv:1808.08449 [math.CO], 2018.
FORMULA
Coefficient of x^n in expansion of Product_{k=1..n} (1+Sum_{d|n} x^(d*k)).
MAPLE
with(numtheory): seq(coeff(mul(1+add(x^(d*k), d=divisors(n)), k=1..n), x, n), n=1..60); # C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 19 2005
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Vladeta Jovovic, Jan 11 2005
EXTENSIONS
More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 19 2005
STATUS
approved