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) = 2*x + 5.

A257615

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) = 2*x + 5.

Terms

    a(0) =1a(1) =5a(2) =5a(3) =25a(4) =70a(5) =25a(6) =125a(7) =715a(8) =715a(9) =125a(10) =625a(11) =6380a(12) =12870a(13) =6380a(14) =625a(15) =3125a(16) =52785a(17) =186010a(18) =186010a(19) =52785a(20) =3125a(21) =15625a(22) =416370a(23) =2360295a(24) =4092220a(25) =2360295a(26) =416370a(27) =15625a(28) =78125a(29) =3180215

External references