17107200domain: NAppears in sequencesa(n) = floor(n!/sigma(n)).at n=11A062359Denominators of series expansion of the e.g.f. for the Catalan numbers.at n=12A144187E.g.f.: Product_{k>=1} (1 + x^(3*k-2) / (3*k-2)).at n=12A326858