Triangle read by rows: T(n,0) = T(n,n) = 1 for n >= 0, T(n,1) = T(n,n-1) = 2*n-1 for n >= 1, T(n,k) = T(n-1,k-1) + T(n-1,k) for 2 <= k <= n-2 and n >= 4.
A026615
Triangle read by rows: T(n,0) = T(n,n) = 1 for n >= 0, T(n,1) = T(n,n-1) = 2*n-1 for n >= 1, T(n,k) = T(n-1,k-1) + T(n-1,k) for 2 <= k <= n-2 and n >= 4.
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) =7a(12) =10a(13) =7a(14) =1a(15) =1a(16) =9a(17) =17a(18) =17a(19) =9a(20) =1a(21) =1a(22) =11a(23) =26a(24) =34a(25) =26a(26) =11a(27) =1a(28) =1a(29) =13
External references
- oeis: A026615