%I #9 Oct 02 2021 10:21:08
%S 2,4,12,49,245,1470,10295,82362,741264,7412647,81539127,978469535,
%T 12720103955,178081455373,2671221830606,42739549289708,
%U 726572337925041,13078302082650740,248487739570364075,4969754791407281515
%N a(n) = floor( exp(5/7)*n! ).
%t Floor[Exp[5/7]Range[20]!] (* _Harvey P. Dale_, Sep 06 2021 *)
%K nonn
%O 1,1
%A _Simon Plouffe_