Triangle, read by rows, T(n, k) = A059481(n,k)*(A059481(n,k) - 1)/2.

Terms

a(0) =0a(1) =1a(2) =3a(3) =3a(4) =15a(5) =45a(6) =6a(7) =45a(8) =190a(9) =595a(10) =10a(11) =105a(12) =595a(13) =2415a(14) =7875a(15) =15a(16) =210a(17) =1540a(18) =7875a(19) =31626a(20) =106491a(21) =21a(22) =378a(23) =3486a(24) =21945a(25) =106491a(26) =426426a(27) =1471470a(28) =28a(29) =630