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) = 3*T(n-1,0) + T(n-1,1), T(n,k) = T(n-1,k-1) + T(n-1,k) + T(n-1,k+1) for k >= 1.
A126954
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) = 3*T(n-1,0) + T(n-1,1), T(n,k) = T(n-1,k-1) + T(n-1,k) + T(n-1,k+1) for k >= 1.
Terms
- a(0) =1a(1) =3a(2) =1a(3) =10a(4) =4a(5) =1a(6) =34a(7) =15a(8) =5a(9) =1a(10) =117a(11) =54a(12) =21a(13) =6a(14) =1a(15) =405a(16) =192a(17) =81a(18) =28a(19) =7a(20) =1a(21) =1407a(22) =678a(23) =301a(24) =116a(25) =36a(26) =8a(27) =1a(28) =4899a(29) =2386
External references
- oeis: A126954