OFFSET
0,10
FORMULA
a(n) = [x^1] Product_{k=1..n} (x^(k^4) + 1 + 1/x^(k^4)).
MAPLE
b:= proc(n, i) option remember; (m-> `if`(n>m, 0, `if`(n=m, 1, b(n, i-1)+
b(abs(n-i^4), i-1)+b(n+i^4, i-1))))(i*(i+1)*(2*i+1)*(3*i^2+3*i-1)/30)
end:
a:= n-> b(1, n):
seq(a(n), n=0..33); # Alois P. Heinz, Jan 30 2024
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Jan 30 2024
EXTENSIONS
a(34)-a(37) from Alois P. Heinz, Jan 30 2024
STATUS
approved