Triangle read by rows: T(n,0) = 3^n, T(n,k) = T(n,k-1) + T(n-1,k) for 0 < k < n, and T(n,n) = T(n,n-1).

A165992

Triangle read by rows: T(n,0) = 3^n, T(n,k) = T(n,k-1) + T(n-1,k) for 0 < k < n, and T(n,n) = T(n,n-1).

Terms

    a(0) =1a(1) =3a(2) =3a(3) =9a(4) =12a(5) =12a(6) =27a(7) =39a(8) =51a(9) =51a(10) =81a(11) =120a(12) =171a(13) =222a(14) =222a(15) =243a(16) =363a(17) =534a(18) =756a(19) =978a(20) =978a(21) =729a(22) =1092a(23) =1626a(24) =2382a(25) =3360a(26) =4338a(27) =4338a(28) =2187a(29) =3279

External references