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) = 3*x + 2.

A257610

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) = 3*x + 2.

Terms

    a(0) =1a(1) =2a(2) =2a(3) =4a(4) =20a(5) =4a(6) =8a(7) =132a(8) =132a(9) =8a(10) =16a(11) =748a(12) =2112a(13) =748a(14) =16a(15) =32a(16) =3964a(17) =25124a(18) =25124a(19) =3964a(20) =32a(21) =64a(22) =20364a(23) =256488a(24) =552728a(25) =256488a(26) =20364a(27) =64a(28) =128a(29) =103100

External references