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 A061178 #3 Mar 31 2012 13:20:05 %S A061178 1,9,51,233,942,3522,12473,42447,140109,451441,1426380,4434420, %T A061178 13599505,41225349,123723351,368080793,1086665562,3186317718, %U A061178 9286256393,26916587307,77634928209,222920650081 %N A061178 Third column (m=2) of triangle A060920 (bisection of Fibonacci triangle, even part). %C A061178 Numerator polynomial of g.f. is sum(A061176(3,m)*x^m,m=0..3). %F A061178 a(n)= A060920(n+2, 2). %F A061178 G.f.: (1-x^3)/(1-3*x+x^2)^3. %Y A061178 A001519, A054444. %K A061178 nonn,easy %O A061178 0,2 %A A061178 _Wolfdieter Lang_, Apr 20 2001