a(n) = Sum_{k=0..n} Stirling1(n,k)^2.

A047796

a(n) = Sum_{k=0..n} Stirling1(n,k)^2.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =14a(4) =194a(5) =4402a(6) =147552a(7) =6838764a(8) =418389078a(9) =32639603798

External references