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 A144047 #8 Apr 20 2020 09:52:36
%S A144047 1,4,22,111,570,2917,15112,78900,416525,2221529,11974498,65211746,
%T A144047 358742016,1992975905,11178149883,63279615534,361464920864,
%U A144047 2082869242399,12104344580384,70924864962233,418922049779244
%N A144047 Limiting values of A136564.
%F A144047 a(n) = A136564(2*n, 3*n) for n > 0. - _Andrew Howroyd_, Apr 20 2020
%o A144047 (PARI) \\ Needs G function from A138107.
%o A144047 a(n)={if(n==0, 1, my(m=2*n); polcoef(G(3*n, x + O(x*x^m)) - G(3*n-1, x + O(x*x^m)), m))} \\ _Andrew Howroyd_, Apr 20 2020
%Y A144047 Cf. A136564, A138107.
%K A144047 more,nonn
%O A144047 0,2
%A A144047 _Benoit Jubin_ and _Vladeta Jovovic_, Sep 08 2008
%E A144047 Offset corrected and a(7)-a(20) from _Andrew Howroyd_, Apr 20 2020