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 A218711 Number of nonnegative solutions to x^2 + y^2 + z^2 < n^2. 0
 0, 1, 8, 23, 51, 90, 157, 230, 341, 471, 639, 835, 1063, 1340, 1671, 2022, 2443, 2893, 3428, 4004, 4653, 5359, 6133, 6977, 7907, 8886, 9991, 11152, 12428, 13724, 15192, 16683, 18358, 20072, 21932, 23880, 25941, 28117, 30397, 32822, 35376, 38013, 40840, 43765, 46880, 50090, 53448, 56911, 60583, 64379 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS FORMULA a(n) = A000604(n) - A181788(n). PROG (JavaScript) for (i=0; i<50; i++) { d=0; for (a=0; a<=i; a++) for (b=0; b<=i; b++) for (c=0; c<=i; c++) if (Math.pow(a, 2)+Math.pow(b, 2)+Math.pow(c, 2)

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Last modified January 18 06:34 EST 2019. Contains 319269 sequences. (Running on oeis4.)