A131448 Denominators of n-th approximation of factorial (also called harmonic) expansion of Euler's constant gamma (A001620).
1, 2, 2, 24, 40, 144, 5040, 40320, 6048, 6048, 19958400, 53222400, 53222400, 87178291200, 118879488000, 5230697472000, 8083805184000, 3201186852864000, 40548366802944000, 2432902008176640000, 17030314057236480000
Offset: 1
Examples
Rationals r(n): [0, 1/2, 1/2, 13/24, 23/40, 83/144, 2909/5040, 23273/40320, 3491/6048, ...]
Formula
a(n) = denominator(r(n)), with r(n) = Sum_{k=1..n} b(k)/k!, and b(k) = A096622(k) (factorial expansion of gamma).
Comments