Least k such that 1+2+...+k >= E{1,2,...,n}, where E is the 4th elementary symmetric function.

Terms

a(0) =7a(1) =23a(2) =57a(3) =116a(4) =212a(5) =356a(6) =562a(7) =845a(8) =1224a(9) =1717a(10) =2345a(11) =3130a(12) =4097a(13) =5272a(14) =6682a(15) =8357a(16) =10327a(17) =12627a(18) =15290a(19) =18353a(20) =21855a(21) =25834a(22) =30332a(23) =35393a(24) =41062a(25) =47385a(26) =54412a(27) =62191a(28) =70776