Triangle T(n,k), 0 <= k <= n, read by rows defined by: T(0,0)=1, T(n,k)=0 if k < 0 or if k > n, T(n,0) = 4*T(n-1,0) + T(n-1,1), T(n,k) = T(n-1,k-1) + 5*T(n-1,k) + T(n-1,k+1) for k >= 1.
A126331
Triangle T(n,k), 0 <= k <= n, read by rows defined by: T(0,0)=1, T(n,k)=0 if k < 0 or if k > n, T(n,0) = 4*T(n-1,0) + T(n-1,1), T(n,k) = T(n-1,k-1) + 5*T(n-1,k) + T(n-1,k+1) for k >= 1.
Terms
- a(0) =1a(1) =4a(2) =1a(3) =17a(4) =9a(5) =1a(6) =77a(7) =63a(8) =14a(9) =1a(10) =371a(11) =406a(12) =134a(13) =19a(14) =1a(15) =1890a(16) =2535a(17) =1095a(18) =230a(19) =24a(20) =1a(21) =10095a(22) =15660a(23) =8240a(24) =2269a(25) =351a(26) =29a(27) =1a(28) =56040a(29) =96635
External references
- oeis: A126331