OFFSET
1,3
LINKS
Ivan Neretin, Table of n, a(n) for n = 1..10000
MATHEMATICA
# - (l = Floor[Sqrt[2 #] - 1/2]) (l + 1)/2 & /@ ((Range@68)^2) (* Ivan Neretin, May 28 2015 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jul 30 2000
STATUS
approved