Number of 3-element subsets of {1,...,n} whose sum has more than 4 divisors.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =3a(6) =8a(7) =15a(8) =27a(9) =38a(10) =54a(11) =71a(12) =95a(13) =119a(14) =152a(15) =186a(16) =230a(17) =277a(18) =338a(19) =404a(20) =486a(21) =571a(22) =672a(23) =777a(24) =901a(25) =1028a(26) =1175a(27) =1327a(28) =1500a(29) =1679