A320126 - OEIS

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A320126

Number of integer solutions to a^2 + b^2 + 2*c^2 + 5*d^2 = n.

14

1, 4, 6, 8, 12, 10, 16, 28, 22, 36, 40, 24, 56, 36, 24, 64, 28, 64, 78, 24, 58, 48, 68, 92, 80, 92, 72, 112, 92, 48, 104, 96, 118, 176, 64, 48, 124, 84, 148, 160, 104, 120, 176, 120, 72, 146, 88, 204, 216, 124, 126, 96, 180, 148, 224, 188, 120, 304, 216, 120, 224, 96

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

COMMENTS

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

LINKS

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

FORMULA

G.f.: theta_3(q)^2 * theta_3(q^2) * theta_3(q^5).

CROSSREFS

Cf. A097057, A320124, A320125, A320127, A320128.

Sequence in context: A320127 A352374 A110646 * A234520 A275789 A031359

Adjacent sequences: A320123 A320124 A320125 * A320127 A320128 A320129

KEYWORD

nonn

AUTHOR

Seiichi Manyama, Oct 06 2018

STATUS

approved