Irregular triangular array T read by rows: T(0,0) = 1, T(0,1) = T(0,2) = 0; T(1,0) = T(1,1) = T(1,2) = 1, T(1,3) = 0; for n >= 2, T(n,0) = 1, T(n,1) = T(n-1,0) + T(n-1,1), T(n,k) = T(n-1,k-2) + T(n-1,k-1) + T(n-1,k) for k = 2,3,...,n+1 and T(n,n+2) = T(n-1,n) + T(n-1,n+1).
A026323
Irregular triangular array T read by rows: T(0,0) = 1, T(0,1) = T(0,2) = 0; T(1,0) = T(1,1) = T(1,2) = 1, T(1,3) = 0; for n >= 2, T(n,0) = 1, T(n,1) = T(n-1,0) + T(n-1,1), T(n,k) = T(n-1,k-2) + T(n-1,k-1) + T(n-1,k) for k = 2,3,...,n+1 and T(n,n+2) = T(n-1,n) + T(n-1,n+1).
Terms
- a(0) =1a(1) =0a(2) =0a(3) =1a(4) =1a(5) =1a(6) =0a(7) =1a(8) =2a(9) =3a(10) =2a(11) =1a(12) =1a(13) =3a(14) =6a(15) =7a(16) =6a(17) =3a(18) =1a(19) =4a(20) =10a(21) =16a(22) =19a(23) =16a(24) =9a(25) =1a(26) =5a(27) =15a(28) =30a(29) =45
External references
- oeis: A026323