Triangle T(n,k) read by rows: T(n,k) = 1 if k=1 or k=n, otherwise T(n,k) = (3*n-3*k+1)*T(n-1,k-1) + (3*k-2)*T(n-1,k).
A142458
Triangle T(n,k) read by rows: T(n,k) = 1 if k=1 or k=n, otherwise T(n,k) = (3*n-3*k+1)*T(n-1,k-1) + (3*k-2)*T(n-1,k).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =8a(5) =1a(6) =1a(7) =39a(8) =39a(9) =1a(10) =1a(11) =166a(12) =546a(13) =166a(14) =1a(15) =1a(16) =677a(17) =5482a(18) =5482a(19) =677a(20) =1a(21) =1a(22) =2724a(23) =47175a(24) =109640a(25) =47175a(26) =2724a(27) =1a(28) =1a(29) =10915
External references
- oeis: A142458