Triangle, read by rows, T(n, k) = 1 - floor(n*(n-1)/4) + floor(binomial(n-1,k-1) * binomial(n, k-1)/(2*k)).

A176125

Triangle, read by rows, T(n, k) = 1 - floor(n*(n-1)/4) + floor(binomial(n-1,k-1) * binomial(n, k-1)/(2*k)).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =6a(5) =1a(6) =1a(7) =19a(8) =19a(9) =1a(10) =1a(11) =43a(12) =78a(13) =43a(14) =1a(15) =1a(16) =85a(17) =232a(18) =232a(19) =85a(20) =1a(21) =1a(22) =151a(23) =571a(24) =865a(25) =571a(26) =151a(27) =1a(28) =1a(29) =249

External references