Triangle read by rows: T(n,r) = binomial(n,r)*binomial(2*n-3*r-4,n-2*r-2)/(n-r-1), n >= 2, r = 0..floor(n/2)-1.

A259097

Triangle read by rows: T(n,r) = binomial(n,r)*binomial(2*n-3*r-4,n-2*r-2)/(n-r-1), n >= 2, r = 0..floor(n/2)-1.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =2a(4) =5a(5) =5a(6) =14a(7) =15a(8) =5a(9) =42a(10) =49a(11) =21a(12) =132a(13) =168a(14) =84a(15) =14a(16) =429a(17) =594a(18) =336a(19) =84a(20) =1430a(21) =2145a(22) =1350a(23) =420a(24) =42a(25) =4862a(26) =7865a(27) =5445a(28) =1980a(29) =330

External references