Triangular array T read by rows: T(n,1) = T(n,n) = 1, T(n,k) = T(n-1, k-1) + T(n-2,k-1) + T(n-1,k) if k=(n/2) or k=((n+1)/2), otherwise T(n,k) = T(n-1,k-1) + T(n-1,k).
A026703
Triangular array T read by rows: T(n,1) = T(n,n) = 1, T(n,k) = T(n-1, k-1) + T(n-2,k-1) + T(n-1,k) if k=(n/2) or k=((n+1)/2), otherwise 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) =5a(8) =5a(9) =1a(10) =1a(11) =6a(12) =13a(13) =6a(14) =1a(15) =1a(16) =7a(17) =24a(18) =24a(19) =7a(20) =1a(21) =1a(22) =8a(23) =31a(24) =61a(25) =31a(26) =8a(27) =1a(28) =1a(29) =9
External references
- oeis: A026703