a(1) = 1; a(n+1) = a(n) * k(n), where k(n) is the number of elements of {a(j)}, 1<=j<=n, which are <= n.
A094590
a(1) = 1; a(n+1) = a(n) * k(n), where k(n) is the number of elements of {a(j)}, 1<=j<=n, which are <= n.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =18a(5) =54a(6) =216a(7) =864a(8) =3456a(9) =13824a(10) =55296a(11) =221184a(12) =884736a(13) =3538944a(14) =14155776a(15) =56623104a(16) =226492416a(17) =905969664a(18) =4529848320a(19) =22649241600a(20) =113246208000a(21) =566231040000
External references
- oeis: A094590