Number of multiset permutations of the n initial elements of A005229 with additional element A005229(0)=1.
A169638
Number of multiset permutations of the n initial elements of A005229 with additional element A005229(0)=1.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =4a(4) =20a(5) =60a(6) =420a(7) =3360a(8) =30240a(9) =151200a(10) =1663200a(11) =9979200a(12) =129729600a(13) =1816214400a(14) =27243216000a(15) =217945728000
External references
- oeis: A169638