OFFSET
0,3
FORMULA
a(n)=sum{k=0..floor(n/2), sum{j=0..n-2k, C(n-2k+j, 2j)*k^j*C(k)}}, C(n) given by A000108.
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, May 21 2005
STATUS
approved