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 A039929 #8 Jun 11 2017 10:12:42 %S A039929 0,1,9,59,450,4114,43512,528492,7235568,110499696,1862118720, %T A039929 34342356960,688092312960,14886351037440,345878769358080, %U A039929 8590707803462400,227153424885811200,6371121297516595200 %N A039929 Second column of Fibonacci Jabotinsky-triangle A039692. %C A039929 E.g.f.: (log(1-x-x^2))^2/2. %F A039929 a(n) = A039692(n, 2); a(n) = (n-1)!*sum(L(j)*L(n-j)/(n-j), j=1..n-1), n >= 2, L(n)= A000032(n) (Lucas). %t A039929 With[{nn=20},CoefficientList[Series[Log[1-x-x^2]^2/2,{x,0,nn}],x] Range[0,nn]!] (* _Harvey P. Dale_, Jun 11 2017 *) %Y A039929 Cf. A039692, A039647, A000032, A005442. %K A039929 easy,nonn %O A039929 1,3 %A A039929 _Wolfdieter Lang_