Triangle T(n, k, q) = c(n-1, q)*c(n, q)/(c(k-1, q)^2*c(n-k, q)*c(n-k+1, q)*f(k, q)), where c(n, q) = Product_{j=1..n} f(j, q), f(n, q) = q*(f(n-1, q) + f(n-2, q)), f(0, q) = 0, f(1, q) = 1, and q = 3, read by rows.
A172376
Triangle T(n, k, q) = c(n-1, q)*c(n, q)/(c(k-1, q)^2*c(n-k, q)*c(n-k+1, q)*f(k, q)), where c(n, q) = Product_{j=1..n} f(j, q), f(n, q) = q*(f(n-1, q) + f(n-2, q)), f(0, q) = 0, f(1, q) = 1, and q = 3, read by rows.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =12a(5) =1a(6) =1a(7) =180a(8) =180a(9) =1a(10) =1a(11) =2565a(12) =38475a(13) =2565a(14) =1a(15) =1a(16) =36936a(17) =7895070a(18) =7895070a(19) =36936a(20) =1a(21) =1a(22) =530712a(23) =1633531536a(24) =23277824388a(25) =1633531536a(26) =530712a(27) =1a(28) =1a(29) =7628985
External references
- oeis: A172376