cp's OEIS Frontend

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.

A039929 Second column of Fibonacci Jabotinsky-triangle A039692.

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%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_