OFFSET
1,2
LINKS
Ivan Neretin, Table of n, a(n) for n = 1..10000
MATHEMATICA
Accumulate@Nest[Flatten@Join[{1}, Range[Accumulate@#]] &, {1}, 4] (* Ivan Neretin, Jan 30 2018 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Leroy Quet, Mar 23 2008
STATUS
approved