Triangle read by rows: T(n,k) = T(n-1,k-1) +T(n-1,k) +n*(n-1)*T(n-2,k-1) for n>4 and 1<=k<=n.

Terms

a(0) =2a(1) =3a(2) =3a(3) =2a(4) =20a(5) =2a(6) =2a(7) =58a(8) =58a(9) =2a(10) =2a(11) =100a(12) =516a(13) =100a(14) =2a(15) =2a(16) =162a(17) =2356a(18) =2356a(19) =162a(20) =2a(21) =2a(22) =248a(23) =6718a(24) =26384a(25) =6718a(26) =248a(27) =2a(28) =2a(29) =362