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a(n) = floor(n^2 / e).
2

%I #8 Dec 30 2014 20:41:07

%S 0,0,1,3,5,9,13,18,23,29,36,44,52,62,72,82,94,106,119,132,147,162,178,

%T 194,211,229,248,268,288,309,331,353,376,400,425,450,476,503,531,559,

%U 588,618,648,680,712,744,778,812,847,883,919,956,994,1033,1072

%N a(n) = floor(n^2 / e).

%t a[n_]:=Floor[(n^2)/E]; (* _Vladimir Joseph Stephan Orlovsky_, Dec 12 2008 *)

%K nonn,easy

%O 0,4

%A _Patrick De Geest_, May 15 1998