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A320196
Number of integer solutions to a^2 + 2*b^2 + 4*c^2 + 7*d^2 = n.
11
1, 2, 2, 4, 4, 4, 8, 10, 10, 10, 16, 12, 16, 28, 16, 20, 24, 24, 18, 28, 32, 8, 40, 32, 24, 34, 32, 32, 34, 56, 20, 40, 42, 40, 64, 56, 32, 32, 72, 28, 72, 64, 32, 60, 72, 84, 36, 88, 56, 66, 98, 40, 80, 40, 80, 104, 68, 44, 40, 92, 52, 116, 80, 42, 72, 100, 96, 84
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) * theta_3(q^7).
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Oct 07 2018
STATUS
approved