Triangle read by rows: T(n,k) (0 <= k <= n) given by T(n,0) = 1, T(n,1) = 2^n - 1, T(n,2) = 2^n - 2, T(n,n-1) = T(n,n) = binomial(2n-2,n-1); and the other internal entries satisfy T(n,k) = T(n,k-1) + T(n-1,k).
A274293
Triangle read by rows: T(n,k) (0 <= k <= n) given by T(n,0) = 1, T(n,1) = 2^n - 1, T(n,2) = 2^n - 2, T(n,n-1) = T(n,n) = binomial(2n-2,n-1); and the other internal entries satisfy T(n,k) = T(n,k-1) + T(n-1,k).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =2a(6) =1a(7) =7a(8) =6a(9) =6a(10) =1a(11) =15a(12) =14a(13) =20a(14) =20a(15) =1a(16) =31a(17) =30a(18) =50a(19) =70a(20) =70a(21) =1a(22) =63a(23) =62a(24) =112a(25) =182a(26) =252a(27) =252a(28) =1a(29) =127
External references
- oeis: A274293