OFFSET
0,2
COMMENTS
Number of placing of at least n objects but no more than 3*n distinct objects in n distinct boxes with the condition that in each box there is at least 1 object but no more than 3. - Adi Dani, May 04 2011
LINKS
David Applegate and N. J. A. Sloane, Table of n, a(n) for n = 0..100
CROSSREFS
KEYWORD
nonn
AUTHOR
David Applegate and N. J. A. Sloane, Dec 08 2008, corrected Jan 14 2009
STATUS
approved