OFFSET
0,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..1000
Pierpaolo Natalini, Paolo Emilio Ricci, New Bell-Sheffer Polynomial Sets, Axioms 2018, 7(4), 71.
Wikipedia, Partition of a set
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, May 22 2017
STATUS
approved