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a(n) = floor(exp(2/3)*n!).
1

%I #8 Apr 09 2020 00:52:54

%S 1,3,11,46,233,1402,9816,78532,706793,7067937,77747310,932967722,

%T 12128580386,169800125411,2547001881168,40752030098692,

%U 692784511677766,12470121210199797,236932302993796153,4738646059875923070

%N a(n) = floor(exp(2/3)*n!).

%H Jinyuan Wang, <a href="/A030976/b030976.txt">Table of n, a(n) for n = 1..449</a>

%K nonn,easy

%O 1,2

%A _Simon Plouffe_