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%I #4 Aug 11 2016 16:07:59
%S 0,0,1,6,25,126,733,5086,40423,363262,3629743,39920638,479011993,
%T 6227066878,87178426333,1307675013118,20922791915023,355687438417918,
%U 6402373740187423,121645100594626558,2432902008831369073
%N (n)! + (n + 1)!!/(n + 1) - 2
%Y Cf. A006882, A128882.
%K nonn,easy
%O 0,4
%A _Olivier Gérard_, Aug 01 2016
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