Many excellent designs for a new banner were submitted. We will use the best of them in rotation.
0,4
Table of n, a(n) for n=0..10.
a(n)=Sum_[k, 0<=k<=n-1}A053121(n-1,k)*a(k)for n>0 with a(0)=1 .
Sequence in context: A152225 A037245 A143017 * A099754 A105633 A196161
Adjacent sequences: A130015 A130016 A130017 * A130019 A130020 A130021
nonn
Philippe Deléham, Jun 16 2007
approved