Sum of squares of the multiplicities of pairwise distances among the vertices of a regular n-gon.

Terms

a(0) =9a(1) =20a(2) =50a(3) =81a(4) =147a(5) =208a(6) =324a(7) =425a(8) =605a(9) =756a(10) =1014a(11) =1225a(12) =1575a(13) =1856a(14) =2312a(15) =2673a(16) =3249a(17) =3700a(18) =4410a(19) =4961a(20) =5819a(21) =6480a(22) =7500a(23) =8281a(24) =9477a(25) =10388a(26) =11774a(27) =12825a(28) =14415a(29) =15616