a(n) = denominator of Sum_{k=2..A335138(n)} abs(A309229(n, k))/k.

Terms

a(0) =6a(1) =15a(2) =20a(3) =15a(4) =4a(5) =35a(6) =360a(7) =630a(8) =420a(9) =1386a(10) =280a(11) =5005a(12) =280a(13) =1287a(14) =3080a(15) =3465a(16) =2520a(17) =770a(18) =27720a(19) =9009a(20) =5720a(21) =16380a(22) =360360a(23) =10010a(24) =360360a(25) =3465a(26) =40040a(27) =25740a(28) =360360a(29) =323323