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 A332519 #29 Aug 12 2025 11:23:01 %S A332519 0,16,40,72,112,160,216,280,352,432,520,616,720,832,952,1080,1216, %T A332519 1360,1512,1672,1840,2016,2200,2392,2592,2800,3016,3240,3472,3712, %U A332519 3960,4216,4480,4752,5032,5320,5616,5920,6232,6552,6880,7216,7560,7912,8272,8640,9016,9400,9792 %N A332519 a(n) = 4*(n^2 + n - 2). %C A332519 The first 6 nonzero values are the same as in A177723, but then they differ. %H A332519 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (3,-3,1). %F A332519 a(n) = A177723(n+5) for n = 1..7. %F A332519 a(n) = 8 * A000096(n-1). %t A332519 a[n]:=a[n]=4(n^2+n-2) %o A332519 (PARI) apply( A332519(n)=(n^2+n-2)<<2, [1..55]) \\ _M. F. Hasler_, Apr 26 2022 %Y A332519 Cf. A000096, A177723. %K A332519 nonn,easy,less %O A332519 1,2 %A A332519 _Michael Terhoeven_, Feb 15 2020