1,2
Table of n, a(n) for n=1..11.
Cf. A000040, A001223, A005250, A053695.
Sequence in context: A141406 A045619 A028690 * A120344 A031426 A258633
Adjacent sequences: A270875 A270876 A270877 * A270879 A270880 A270881
nonn,hard,more
Marc Morgenegg, Apr 05 2016
Edited by N. J. A. Sloane, May 23 2016 at the suggestion of R. J. Mathar and Giovanni Resta.
approved