This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A055419 #13 Aug 31 2025 09:12:53 %S A055419 1,5,17,54,165,482,1319,3390,8262,19250,43154,93601,197381,406200, %T A055419 817954,1614348,3126068,5943728,11103912,20396957,36869790,65637607, %U A055419 115178814,199377387,340708159,575150851,959691775,1583660542 %N A055419 Number of points in N^n of norm <= 4. %H A055419 Andrew Howroyd, <a href="/A055419/b055419.txt">Table of n, a(n) for n = 0..1000</a> %H A055419 <a href="/index/Rec#order_17">Index entries for linear recurrences with constant coefficients</a>, signature (17,-136,680,-2380,6188,-12376,19448,-24310,24310,-19448,12376,-6188,2380,-680,136,-17,1). %F A055419 Empirical g.f.: (11*x^16 -164*x^15 +936*x^14 -2841*x^13 +5310*x^12 -6697*x^11 +6044*x^10 -3984*x^9 +1734*x^8 -75*x^7 -741*x^6 +827*x^5 -539*x^4 +235*x^3 -68*x^2 +12*x -1) / (x -1)^17. - _Colin Barker_, Jul 07 2013 %Y A055419 Row n=4 of A302998. %K A055419 nonn,changed %O A055419 0,2 %A A055419 _David W. Wilson_