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 A139616 #24 Apr 08 2024 21:30:26 %S A139616 16,136,256,376,496,616,736,856,976,1096,1216,1336,1456,1576,1696, %T A139616 1816,1936,2056,2176,2296,2416,2536,2656,2776,2896,3016,3136,3256, %U A139616 3376,3496,3616,3736,3856,3976,4096,4216,4336,4456,4576,4696,4816 %N A139616 a(n) = 120*n + 16. %C A139616 Numbers of the 16th column of positive numbers in the square array of nonnegative and polygonal numbers A139600. Also, numbers of the 16th column in the square array A057145. %H A139616 Vincenzo Librandi, <a href="/A139616/b139616.txt">Table of n, a(n) for n = 0..5000</a> %H A139616 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1). %F A139616 a(n) = 2*a(n-1)-a(n-2). - _Wesley Ivan Hurt_, Jun 17 2021 %F A139616 From _Elmo R. Oliveira_, Apr 04 2024: (Start) %F A139616 G.f.: 8*(2+13*x)/(x-1)^2. %F A139616 E.g.f.: 8*exp(x)*(2 + 15*x). %F A139616 a(n) = 8*(A008597(n) + 2). (End) %o A139616 (Magma) [8*(15*n + 2): n in [0..60]]; // _Vincenzo Librandi_, Jul 23 2011 %o A139616 (PARI) a(n)=120*n+16 \\ _Charles R Greathouse IV_, Oct 05 2011 %Y A139616 Cf. A008597, A057145, A139600. %K A139616 easy,nonn %O A139616 0,1 %A A139616 _Omar E. Pol_, Apr 27 2008