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

1,2

Comments

For the rationals r(n) see the W. Lang link found under A131443.

Links

Table of n, a(n) for n=1..20.

Formula

a(n) = denominator(r(n)), with r(n) = Sum_{k=1..n} b(k)/k!, with b(k) = A068451(k).

Example

Rationals r(n):[1, 3/2, 3/2, 19/12, 97/60, 97/60, 453/280, 65239/40320,...].

Crossrefs

Cf. A001622, A068451, A131443 (numerators).

Sequence in context: A349529 A173842 A352526 * A291541 A180072 A367546

Adjacent sequences: A131441 A131442 A131443 * A131445 A131446 A131447

Keyword

nonn,frac,easy

Author

Wolfdieter Lang, Aug 07 2007

Status

approved