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 A120473 #9 Jun 30 2025 20:04:52
%S A120473 -1,1,-2,3,0,-8,0,21,0,0,-89,144,-233,0,0,987,0,0,0,-6765,10946,0,
%T A120473 -28657,46368,-75025,0,196418,-317811,0,0
%N A120473 a(n) = A000045[n]*(A004001[n + 1] - 2*A004001[n] + A004001[n - 1]).
%t A120473 Conway[0] = 0; Conway[1] = Conway[2] = 1; Conway[n_Integer?Positive] := Conway[n] = Conway[Conway[n - 1]] + Conway[n - Conway[n - 1]] a[n_] := Fibonacci[n]*(Conway[n + 1] - 2*Conway[n] + Conway[n - 1]) Table[a[n], {n, 1, 30}]
%Y A120473 Cf. A000045, A004001, A120474, A120475.
%K A120473 sign
%O A120473 0,3
%A A120473 _Roger L. Bagula_, Jul 06 2006
%E A120473 Edited by _N. J. A. Sloane_, Oct 01 2006