Minimum value unattainable as the sum of 3 attained values of a*b*c with a,b,c 0..n integers.

Terms

a(0) =4a(1) =15a(2) =50a(3) =110a(4) =222a(5) =379a(6) =632a(7) =977a(8) =1372a(9) =1911a(10) =2773a(11) =3325a(12) =4579a(13) =5647a(14) =6949a(15) =8837a(16) =10730a(17) =12421a(18) =15341a(19) =17361a(20) =20609a(21) =23147a(22) =27601a(23) =30529a(24) =35729a(25) =39783a(26) =45565a(27) =50689a(28) =56263a(29) =62647