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A055433
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Number of points in Z^n of norm <= 9.
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2
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1, 19, 253, 3071, 32633, 313259, 2787125, 23120727, 179773681, 1318315075, 9183188589, 61157195951, 390820296297, 2405500230619, 14298590156965, 82219631208967, 458093162029537, 2477433774277747, 13028767115904989
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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a[n_] := SeriesCoefficient[1/(1-x) Sum[x^(i^2), {i, -9, 9}]^n, {x, 0, 81}];
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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