This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A352608 #5 Mar 23 2022 12:52:36 %S A352608 1,1,4,15,120,780,9744,92085,1589760,19983915,445344000,7053735150, %T A352608 194162549760,3735730993995,123152970608640,2803291544678625, %U A352608 108175188829962240,2855475766145702700,126726160086516695040,3818865908630429932275,192201344414226343526400 %N A352608 a(n) = Bell(n)*n!!. %F A352608 a(n) = A000110(n)*A006882(n). %p A352608 seq(doublefactorial(n)*combinat:-bell(n), n=0..20); %Y A352608 Cf. A000110, A006882, A081066. %K A352608 nonn %O A352608 0,3 %A A352608 _Peter Luschny_, Mar 23 2022