OFFSET
1,2
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
MATHEMATICA
Table[Ceiling[1/6 (-3+Sqrt[9+12n(1+n)(1+2n)])], {n, 60}] (* Harvey P. Dale, Oct 06 2020 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved