Triangle read by rows: T(n,k) = t(n-k, k); t(n,m) = f(m)*t(n-1,m) + f(n)*t(n,m-1), where f(x) = 9*x + 2.

A257619

Triangle read by rows: T(n,k) = t(n-k, k); t(n,m) = f(m)*t(n-1,m) + f(n)*t(n,m-1), where f(x) = 9*x + 2.

Terms

    a(0) =1a(1) =2a(2) =2a(3) =4a(4) =44a(5) =4a(6) =8a(7) =564a(8) =564a(9) =8a(10) =16a(11) =6436a(12) =22560a(13) =6436a(14) =16a(15) =32a(16) =71404a(17) =637844a(18) =637844a(19) =71404a(20) =32a(21) =64a(22) =786948a(23) =15470232a(24) =36994952a(25) =15470232a(26) =786948a(27) =64a(28) =128a(29) =8660012

External references