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 A248469 #22 Nov 11 2024 21:19:56
%S A248469 0,2,6,11,18,26,36,47,59,73,89,105,124,144,165,188,212,238,265,294,
%T A248469 324,356,389,423,459,497,536,576,618,662,707,753,801,850,901,953,1007,
%U A248469 1062,1119,1177,1236,1297,1360,1424,1489,1556,1625,1695,1766,1839
%N A248469 a(n) = floor((2*n^2)/e).
%F A248469 a(n) = floor((2*n^2)/e).
%t A248469 Table[Floor[(2 n^2)/ E ], {n, 1, 60}] (* _Vincenzo Librandi_, Oct 23 2014 *)
%o A248469 (Java) int a(int n) {return (int) ((2*Math.pow(x, 2))/Math.exp(1.0)); }
%o A248469 (PARI) a(n) = (2*n^2)\exp(1) \\ _Michel Marcus_, Oct 25 2014
%Y A248469 Cf. A032635 (floor(n^2/e)).
%K A248469 nonn,easy
%O A248469 1,2
%A A248469 _Juliann Barbella_, Oct 06 2014
%E A248469 More terms from _Vincenzo Librandi_, Oct 23 2014