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 A246662 #4 Sep 14 2014 03:42:52 %S A246662 -10,7,-3,1,0,1,5,31,222,1807,16485,166657,1849712,22363201,292571325, %T A246662 4118361751,62067997590,997206323191,17014575491837,307259565176257, %U A246662 5854946313840720,117406185841990657,2471384848995644517,54487872863746170031,1255692460715157555230 %N A246662 a(n) = 2*(K(n,2)*I(4,2) - (-1)^n*I(n,2)*K(4,2)) where I(n,x) and K(n,x) are Bessel functions. %F A246662 a(n) = a(-n). %F A246662 a(n+4) = A058309(n). %p A246662 a := n -> 2*(BesselK(n,2)*BesselI(4,2)-(-1)^n*BesselI(n,2)* BesselK(4,2)); seq(round(evalf(a(n), 99)), n=0..24); %Y A246662 Cf. A058309. %K A246662 sign %O A246662 0,1 %A A246662 _Peter Luschny_, Sep 12 2014