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 A093146 #11 Sep 03 2019 03:38:58 %S A093146 1,5,50,750,12500,212500,3625000,61875000,1056250000,18031250000, %T A093146 307812500000,5254687500000,89703125000000,1531328125000000, %U A093146 26141406250000000,446261718750000000,7618164062500000000 %N A093146 Third binomial transform of Pell(3n-1). %H A093146 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (20,-50). %F A093146 G.f.: (1-15*x)/(1 - 20*x + 50*x^2); %F A093146 a(n) = (10 + 5*sqrt(2))^n*(1/2 - sqrt(2)/4) + (10 - 5*sqrt(2))^n*(1/2 + sqrt(2)/4). %Y A093146 Cf. A000129, A093144, A093147. %K A093146 easy,nonn %O A093146 0,2 %A A093146 _Paul Barry_, Mar 26 2004