Triangle T(n, k) = (1/k)*binomial(n-1, k-1)*binomial(n, k-1)*2^(k-1) if floor(n/2) >= k, otherwise (1/k)*binomial(n-1, k-1)*binomial(n, k-1)*2^(n-k), read by rows.

A174345

Triangle T(n, k) = (1/k)*binomial(n-1, k-1)*binomial(n, k-1)*2^(k-1) if floor(n/2) >= k, otherwise (1/k)*binomial(n-1, k-1)*binomial(n, k-1)*2^(n-k), read by rows.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =6a(5) =1a(6) =1a(7) =12a(8) =12a(9) =1a(10) =1a(11) =20a(12) =80a(13) =20a(14) =1a(15) =1a(16) =30a(17) =200a(18) =200a(19) =30a(20) =1a(21) =1a(22) =42a(23) =420a(24) =1400a(25) =420a(26) =42a(27) =1a(28) =1a(29) =56

External references