1,2

1 <= a(n) <= n; conjecture: a(n) < n for n>13.

Table of n, a(n) for n=1..75.

a(n) = Sum(A010051(A117530(n,k)): 1 <= k <= n).

Sequence in context: A214127 A111607 A327124 * A275940 A105555 A066858

Adjacent sequences: A117528 A117529 A117530 * A117532 A117533 A117534

nonn

Reinhard Zumkeller, Mar 25 2006

approved