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 A202493 #22 Mar 31 2020 17:24:24 %S A202493 1,15,105,532,2241,8361,28610,91740,279624,818272,2315712,6372480, %T A202493 17123840,45082368,116596224,296879104,745543680,1849344000, %U A202493 4536958976,11020075008,26526547968,63329075200,150057123840 %N A202493 Column k = 4 of triangular array in A165241. %H A202493 Vincenzo Librandi, <a href="/A202493/b202493.txt">Table of n, a(n) for n = 0..1000</a> %H A202493 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (10,-40,80,-80,32). %F A202493 a(n) = A165241(n+4,4). %F A202493 G.f.: (1+5x-5x^2+2x^3+x^4-x^5)/(1-2x)^5. %F A202493 a(n) = 2^n*(n+4)*(27*n^3+126*n^2+169*n+62)/256 for n>0. - _Bruno Berselli_, Dec 21 2011 %Y A202493 Cf. A011782, A084858, A165241, A202480, A202481. %K A202493 nonn,easy %O A202493 0,2 %A A202493 _Philippe Deléham_, Dec 20 2011 %E A202493 a(12) added by _Bruno Berselli_, Dec 21 2011