Triangle T(n, k) = ((n-k)/6)*binomial(n-1, k-1)*binomial(2*n, 2*k) with T(n, 0) = T(n, n) = 1, read by rows.

A174119

Triangle T(n, k) = ((n-k)/6)*binomial(n-1, k-1)*binomial(2*n, 2*k) with T(n, 0) = T(n, n) = 1, read by rows.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =5a(8) =5a(9) =1a(10) =1a(11) =14a(12) =70a(13) =14a(14) =1a(15) =1a(16) =30a(17) =420a(18) =420a(19) =30a(20) =1a(21) =1a(22) =55a(23) =1650a(24) =4620a(25) =1650a(26) =55a(27) =1a(28) =1a(29) =91

External references