A131444 Denominators of n-th approximation of factorial (also called harmonic) expansion of the golden ratio phi (A001622).
1, 2, 2, 12, 60, 60, 280, 40320, 22680, 3628800, 1900800, 479001600, 6227020800, 6227020800, 1307674368000, 1307674368000, 13680285696000, 582033973248000, 24329020081766400, 2432902008176640000
Offset: 1
Examples
Rationals r(n):[1, 3/2, 3/2, 19/12, 97/60, 97/60, 453/280, 65239/40320,...].
Formula
a(n) = denominator(r(n)), with r(n) = Sum_{k=1..n} b(k)/k!, with b(k) = A068451(k).
Comments