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 A131444 #12 Jan 28 2025 10:42:01
%S A131444 1,2,2,12,60,60,280,40320,22680,3628800,1900800,479001600,6227020800,
%T A131444 6227020800,1307674368000,1307674368000,13680285696000,
%U A131444 582033973248000,24329020081766400,2432902008176640000
%N A131444 Denominators of n-th approximation of factorial (also called harmonic) expansion of the golden ratio phi (A001622).
%C A131444 For the rationals r(n) see the W. Lang link found under A131443.
%F A131444 a(n) = denominator(r(n)), with r(n) = Sum_{k=1..n} b(k)/k!, with b(k) = A068451(k).
%e A131444 Rationals r(n):[1, 3/2, 3/2, 19/12, 97/60, 97/60, 453/280, 65239/40320,...].
%Y A131444 Cf. A001622, A068451, A131443 (numerators).
%K A131444 nonn,frac,easy
%O A131444 1,2
%A A131444 _Wolfdieter Lang_, Aug 07 2007