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A055431 Number of points in Z^n of norm <= 7. 2
1, 15, 149, 1419, 11833, 89527, 622573, 4031123, 24499121, 140246303, 759891589, 3936654683, 19595418729, 94005744199, 435555727453, 1952358697443, 8479351841889, 35738244759855, 146442095372661, 584453833956395 (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, -7, 7}]^n, {x, 0, 49}];

a /@ Range[0, 19] (* Jean-Fran├žois Alcover, Sep 29 2019, from A302997 *)

CROSSREFS

Row n=7 of A302997.

Sequence in context: A051272 A021414 A211847 * A119998 A119511 A023069

Adjacent sequences:  A055428 A055429 A055430 * A055432 A055433 A055434

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified August 5 22:41 EDT 2021. Contains 346488 sequences. (Running on oeis4.)