Integer part of Gauss's Arithmetic-Geometric Mean M(2,n^3).

Terms

a(0) =1a(1) =4a(2) =10a(3) =20a(4) =35a(5) =55a(6) =82a(7) =116a(8) =157a(9) =206a(10) =265a(11) =333a(12) =411a(13) =500a(14) =601a(15) =714a(16) =839a(17) =978a(18) =1130a(19) =1298a(20) =1480a(21) =1678a(22) =1892a(23) =2123a(24) =2371a(25) =2637a(26) =2922a(27) =3225a(28) =3548a(29) =3892