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(n)! + (n + 1)!!/(n + 1) - 2
0

%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 GĂ©rard_, Aug 01 2016