Triangle T(n,k), 0 <= k <= n, read by rows given by: T(0,0)=1, T(n,k)=0 if k < 0 or if k > n, T(n,0) = T(n-1,1), T(n,k) = T(n-1,k-1) + 3*T(n-1,k) + T(n-1,k+1) for k >= 1.
A126970
Triangle T(n,k), 0 <= k <= n, read by rows given by: T(0,0)=1, T(n,k)=0 if k < 0 or if k > n, T(n,0) = T(n-1,1), T(n,k) = T(n-1,k-1) + 3*T(n-1,k) + T(n-1,k+1) for k >= 1.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =1a(4) =3a(5) =1a(6) =3a(7) =11a(8) =6a(9) =1a(10) =11a(11) =42a(12) =30a(13) =9a(14) =1a(15) =42a(16) =167a(17) =141a(18) =58a(19) =12a(20) =1a(21) =167a(22) =684a(23) =648a(24) =327a(25) =95a(26) =15a(27) =1a(28) =684a(29) =2867
External references
- oeis: A126970