Triangle T(n,k) read by rows: T(n,k) = (n-k+1)*T(n-1,k-1) + (3*k-2)*k*T(n-1,k), initialized by T(n,1) = T(n,n) = 1.

A166972

Triangle T(n,k) read by rows: T(n,k) = (n-k+1)*T(n-1,k-1) + (3*k-2)*k*T(n-1,k), initialized by T(n,1) = T(n,n) = 1.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =10a(5) =1a(6) =1a(7) =83a(8) =41a(9) =1a(10) =1a(11) =668a(12) =1110a(13) =122a(14) =1a(15) =1a(16) =5349a(17) =25982a(18) =8210a(19) =309a(20) =1a(21) =1a(22) =42798a(23) =572367a(24) =432328a(25) =44715a(26) =714a(27) =1a(28) =1a(29) =342391

External references