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A320193
Number of integer solutions to a^2 + 2*b^2 + 4*c^2 + 4*d^2 = n.
11
1, 2, 2, 4, 6, 8, 12, 16, 14, 14, 24, 20, 20, 24, 16, 16, 30, 36, 14, 36, 40, 32, 60, 48, 36, 42, 72, 40, 48, 56, 16, 64, 62, 40, 36, 64, 42, 72, 108, 48, 72, 84, 96, 84, 100, 56, 48, 96, 68, 114, 42, 72, 120, 104, 120, 80, 112, 72, 168, 116, 48, 120, 64, 112, 126, 96
OFFSET
0,2
COMMENTS
a(n) > 0 for n >= 0.
LINKS
FORMULA
G.f.: theta_3(q) * theta_3(q^2) * theta_3(q^4)^2.
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Oct 07 2018
STATUS
approved