A085121 - OEIS

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A085121

Number of ways of writing n as the sum of three odd squares.

0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 24, 0, 0, 0, 0, 0, 0, 0, 24, 0, 0, 0, 0, 0, 0, 0, 32, 0, 0, 0, 0, 0, 0, 0, 48, 0, 0, 0, 0, 0, 0, 0, 24, 0, 0, 0, 0, 0, 0, 0, 48, 0, 0, 0, 0, 0, 0, 0, 72, 0, 0, 0, 0, 0, 0, 0, 24, 0, 0, 0, 0, 0, 0, 0, 56, 0, 0, 0, 0, 0, 0, 0, 72, 0, 0, 0, 0, 0, 0, 0, 48, 0, 0, 0, 0, 0, 0, 0, 72 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	REFERENCES	`J. E. Jones [Lennard-Jones] and A. E. Ingham, On the calculation of certain crystal potential constants and on the cubic crystal of least energy, Proc. Royal Soc., A 107 (1925), 636-653 (see p. 650).`
	FORMULA	`G.f.: (Sum_{n=-inf..inf} q^((2n+1)^2))^3.`
	CROSSREFS	`Cf. A005875. Equals 8A008437. The nonzero coefficients give A005878.` `Sequence in context: A067485 A180225 A127886 A079204 A199619 A036482` `Adjacent sequences: A085118 A085119 A085120 * A085122 A085123 A085124`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Apr 25 2004`

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Last modified February 15 02:38 EST 2012. Contains 205689 sequences.