Triangular array T read by rows: T(n,0) = T(n,n) = 1 for all n >= 0, T(n,k) = T(n-1,k-1) + T(n-1,k) for odd n and 1< = k <= n-1, T(n,k) = T(n-1,k-1) + T(n-1,k) + T(n-2,k-1) for even n and 1 <= k <= n-1.
A026374
Triangular array T read by rows: T(n,0) = T(n,n) = 1 for all n >= 0, T(n,k) = T(n-1,k-1) + T(n-1,k) for odd n and 1< = k <= n-1, T(n,k) = T(n-1,k-1) + T(n-1,k) + T(n-2,k-1) for even n and 1 <= k <= n-1.
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) =6a(12) =11a(13) =6a(14) =1a(15) =1a(16) =7a(17) =17a(18) =17a(19) =7a(20) =1a(21) =1a(22) =9a(23) =30a(24) =45a(25) =30a(26) =9a(27) =1a(28) =1a(29) =10
External references
- oeis: A026374