Triangular array T read by rows: T(n,0) = T(n,2n) = 1 for n >= 0; T(n,1) = 1 for n >= 1; T(n,k) = T(n-1,k-2) + T(n-1,k-1) for k = 2..2n-1, n >= 2.
A027926
Triangular array T read by rows: T(n,0) = T(n,2n) = 1 for n >= 0; T(n,1) = 1 for n >= 1; T(n,k) = T(n-1,k-2) + T(n-1,k-1) for k = 2..2n-1, n >= 2.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =2a(7) =2a(8) =1a(9) =1a(10) =1a(11) =2a(12) =3a(13) =4a(14) =3a(15) =1a(16) =1a(17) =1a(18) =2a(19) =3a(20) =5a(21) =7a(22) =7a(23) =4a(24) =1a(25) =1a(26) =1a(27) =2a(28) =3a(29) =5
External references
- oeis: A027926