OFFSET
0,11
LINKS
EXAMPLE
a(35) = 6 because we have [25, 9, 1], [25, 1, 9], [9, 25, 1], [9, 1, 25], [1, 25, 9] and [1, 9, 25].
MAPLE
N:= 200: # for a(0)..a(N)
G:= mul(1+t*x^(i^2), i=1..floor(sqrt(N)), 2):
F:= proc(n) local R, k, v;
R:= coeff(G, x, n);
add(k!*coeff(R, t, k), k=1..degree(R, t))
end proc:
F(0):= 1:
map(F, [$0..N]); # Robert Israel, Feb 03 2020
CROSSREFS
KEYWORD
nonn,look
AUTHOR
Ilya Gutkovskiy, Feb 01 2020
STATUS
approved