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A236928 Number of integer solutions to a^2 + b^2 + c^2 + 2*d^2 = n. 9
1, 6, 14, 20, 30, 40, 36, 48, 62, 42, 72, 100, 68, 120, 112, 48, 126, 108, 98, 180, 136, 160, 180, 144, 132, 126, 216, 200, 240, 280, 112, 192, 254, 120, 252, 320, 210, 360, 324, 144, 264, 252, 288, 420, 340, 280, 336, 288, 260, 342, 294, 360, 408, 520, 360, 240, 496 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..56.

MAPLE

See A236924.

CROSSREFS

For number of solutions to a^2+b^2+c^2+k*d^2=n for k=1, 2, 3, 4, 5, 6, 7, 8, 12 see A000118, A236928, A236926, A236923, A236930, A236931, A236932, A236927, A236933.

Sequence in context: A173870 A101567 A123267 * A064708 A064709 A118129

Adjacent sequences:  A236925 A236926 A236927 * A236929 A236930 A236931

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Feb 15 2014

STATUS

approved

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Last modified May 27 22:57 EDT 2017. Contains 287210 sequences.