Triangular array T read by rows: T(n,0) = T(n,n) = 1 for n >= 0; for n >= 1, T(n,1) = T(n,n-1) = n+1; for n >= 2, T(n,k) = T(n-1,k-1) + T(n-2,k-1) + T(n-1,k) if n is even and k = n/2, else T(n,k) = T(n-1,k-1) + T(n-1,k).
A026670
Triangular array T read by rows: T(n,0) = T(n,n) = 1 for n >= 0; for n >= 1, T(n,1) = T(n,n-1) = n+1; for n >= 2, T(n,k) = T(n-1,k-1) + T(n-2,k-1) + T(n-1,k) if n is even and k = n/2, else T(n,k) = T(n-1,k-1) + T(n-1,k).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =1a(6) =1a(7) =4a(8) =4a(9) =1a(10) =1a(11) =5a(12) =11a(13) =5a(14) =1a(15) =1a(16) =6a(17) =16a(18) =16a(19) =6a(20) =1a(21) =1a(22) =7a(23) =22a(24) =43a(25) =22a(26) =7a(27) =1a(28) =1a(29) =8
External references
- oeis: A026670