Minimum value unattainable as the sum of 2 attained values of a*b+a*c+b*c with a,b,c 0..n integers.

Terms

a(0) =5a(1) =18a(2) =40a(3) =70a(4) =109a(5) =154a(6) =209a(7) =285a(8) =373a(9) =458a(10) =568a(11) =670a(12) =802a(13) =946a(14) =1102a(15) =1246a(16) =1424a(17) =1614a(18) =1747a(19) =1957a(20) =2179a(21) =2375a(22) =2619a(23) =2875a(24) =3143a(25) =3423a(26) =3715a(27) =4019a(28) =4335a(29) =4558