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A055433 Number of points in Z^n of norm <= 9. 2
1, 19, 253, 3071, 32633, 313259, 2787125, 23120727, 179773681, 1318315075, 9183188589, 61157195951, 390820296297, 2405500230619, 14298590156965, 82219631208967, 458093162029537, 2477433774277747, 13028767115904989 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Andrew Howroyd, Table of n, a(n) for n = 0..1000

MATHEMATICA

a[n_] := SeriesCoefficient[1/(1-x) Sum[x^(i^2), {i, -9, 9}]^n, {x, 0, 81}];

a /@ Range[0, 18] (* Jean-Fran├žois Alcover, Sep 29 2019, from A302997 *)

CROSSREFS

Row n=9 of A302997.

Sequence in context: A293917 A009762 A017952 * A185425 A009728 A027532

Adjacent sequences:  A055430 A055431 A055432 * A055434 A055435 A055436

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified July 27 13:36 EDT 2021. Contains 346306 sequences. (Running on oeis4.)