888656868019domain: NAppears in sequencesNumerator of Sum_{k=0..n} 1/k!.at n=15A061354Squarefree part of the total number of arrangements of a set with n elements.at n=15A222637Pairs p, q for those partial sums p/q of the series e = sum_{n>=0} 1/n! that are not convergents to e.at n=26A233044