Number of ordered septuples of distinct pairwise coprime positive integers with largest element n.

Terms

a(0) =6a(1) =0a(2) =0a(3) =2a(4) =56a(5) =1a(6) =219a(7) =13a(8) =27a(9) =15a(10) =777a(11) =28a(12) =640a(13) =102a(14) =563a(15) =127a(16) =3923a(17) =28a(18) =7859a(19) =1792a(20) =1505a(21) =966a(22) =2354a(23) =392a(24) =21313a(25) =2289a(26) =3969a(27) =1344a(28) =42828a(29) =714