Triangle, read by rows, where T(n,k) = T(n,k-1) + T(n-1,k-2) for n>=k>=2, with T(n+1,1) = T(n+1,0) = T(n,n) and T(0,0) = 1 for n>=0.
A130521
Triangle, read by rows, where T(n,k) = T(n,k-1) + T(n-1,k-2) for n>=k>=2, with T(n+1,1) = T(n+1,0) = T(n,n) and T(0,0) = 1 for n>=0.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =2a(7) =2a(8) =3a(9) =4a(10) =4a(11) =4a(12) =6a(13) =8a(14) =11a(15) =11a(16) =11a(17) =15a(18) =19a(19) =25a(20) =33a(21) =33a(22) =33a(23) =44a(24) =55a(25) =70a(26) =89a(27) =114a(28) =114a(29) =114
External references
- oeis: A130521