OFFSET
0,3
LINKS
Vaclav Kotesovec, Table of n, a(n) for n = 0..447
Swapnil Garg, Alan Peng, Classical and consecutive pattern avoidance in rooted forests, arXiv:2005.08889 [math.CO], May 2020.
Peter Luschny, Permutation Trees
FORMULA
EXAMPLE
a(4) = 5*0 + 4*1 + 3*14 + 2*8 + 1*1 = 63.
PROG
CROSSREFS
KEYWORD
nonn
AUTHOR
Peter Luschny, Dec 06 2015
STATUS
approved