Triangle T(n, k) (1 <= k <= n) read by rows: T(n, k) is the numerator of R(n, k) where R(n, k) = R(n, k-1)/2 + R(n-1, k-1) for 1 < k <= n with R(n, 1) = R(n-1, n-1) for n > 1, R(1, 1) = 1.

A386393

Triangle T(n, k) (1 <= k <= n) read by rows: T(n, k) is the numerator of R(n, k) where R(n, k) = R(n, k-1)/2 + R(n-1, k-1) for 1 < k <= n with R(n, 1) = R(n-1, n-1) for n > 1, R(1, 1) = 1.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =3a(4) =7a(5) =19a(6) =19a(7) =43a(8) =99a(9) =251a(10) =251a(11) =555a(12) =1243a(13) =2827a(14) =6843a(15) =6843a(16) =14875a(17) =32635a(18) =72411a(19) =162875a(20) =381851a(21) =381851a(22) =819803a(23) =1771803a(24) =3860443a(25) =8494747a(26) =18918747a(27) =43357211a(28) =43357211a(29) =92234139

External references