Bisection of main diagonal of A115009.

Terms

a(0) =6a(1) =86a(2) =418a(3) =1282a(4) =3106a(5) =6394a(6) =11822a(7) =20074a(8) =32086a(9) =48934a(10) =71554a(11) =101250a(12) =139350a(13) =187254a(14) =246690a(15) =319346a(16) =407302a(17) =511714a(18) =634726a(19) =779074a(20) =946622a(21) =1140238a(22) =1362082a(23) =1614994a(24) =1901930a(25) =2224654a(26) =2587402a(27) =2992414a(28) =3441754a(29) =3941074