Number triangle T(n,k) = lcm(1,..,2*n+2)/lcm(1,..,2*k+2).

Terms

a(0) =1a(1) =6a(2) =1a(3) =30a(4) =5a(5) =1a(6) =420a(7) =70a(8) =14a(9) =1a(10) =1260a(11) =210a(12) =42a(13) =3a(14) =1a(15) =13860a(16) =2310a(17) =462a(18) =33a(19) =11a(20) =1a(21) =180180a(22) =30030a(23) =6006a(24) =429a(25) =143a(26) =13a(27) =1a(28) =360360a(29) =60060