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%I #5 Mar 23 2022 12:52:36
%S 1,1,4,15,120,780,9744,92085,1589760,19983915,445344000,7053735150,
%T 194162549760,3735730993995,123152970608640,2803291544678625,
%U 108175188829962240,2855475766145702700,126726160086516695040,3818865908630429932275,192201344414226343526400
%N a(n) = Bell(n)*n!!.
%F a(n) = A000110(n)*A006882(n).
%p seq(doublefactorial(n)*combinat:-bell(n), n=0..20);
%Y Cf. A000110, A006882, A081066.
%K nonn
%O 0,3
%A _Peter Luschny_, Mar 23 2022