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a(n) = floor( exp(5/7)*n! ).
0

%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_