A320150 Number of integer solutions to a^2 + 2*b^2 + 2*c^2 + 3*d^2 = n.

1, 2, 4, 10, 10, 16, 24, 12, 28, 26, 8, 48, 30, 28, 72, 32, 34, 64, 28, 36, 80, 60, 72, 96, 72, 42, 56, 82, 36, 112, 120, 60, 124, 96, 32, 96, 130, 76, 216, 140, 56, 160, 48, 84, 144, 112, 144, 192, 150, 86, 84, 128, 140, 208, 240, 96, 216, 180, 56, 240, 96, 124, 360

Offset: 0

Author

Seiichi Manyama, Oct 06 2018

Keywords

• nonn

Comments

a(n) > 0 for n >= 0.

Links

• Seiichi Manyama, Table of n, a(n) for n = 0..10000

Crossrefs

Cf. A320149, A236924, A320151, A320152, A320153.

Formula

G.f.: theta_3(q) * theta_3(q^2)^2 * theta_3(q^3).