Maximum value of the cyclic convolution of the first n positive integers with themselves.

Terms

a(0) =1a(1) =5a(2) =13a(3) =28a(4) =50a(5) =83a(6) =126a(7) =184a(8) =255a(9) =345a(10) =451a(11) =580a(12) =728a(13) =903a(14) =1100a(15) =1328a(16) =1581a(17) =1869a(18) =2185a(19) =2540a(20) =2926a(21) =3355a(22) =3818a(23) =4328a(24) =4875a(25) =5473a(26) =6111a(27) =6804a(28) =7540a(29) =8335