OFFSET
6,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 6..1000
FORMULA
a(n) = [x^n y^6] Product_{j>=1} 1/(1-y*x^j)^A000009(j).
MAPLE
g:= proc(n) option remember; `if`(n=0, 1, add(add(`if`(d::odd,
d, 0), d=numtheory[divisors](j))*g(n-j), j=1..n)/n)
end:
b:= proc(n, i) option remember; series(`if`(n=0, 1, `if`(i<1, 0,
add(b(n-i*j, i-1)*x^j*binomial(g(i)+j-1, j), j=0..n/i))), x, 7)
end:
a:= n-> coeff(b(n$2), x, 6):
seq(a(n), n=6..60);
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Oct 21 2018
STATUS
approved