a(n) = A051201(n^2).

Terms

a(0) =1a(1) =7a(2) =19a(3) =39a(4) =66a(5) =103a(6) =146a(7) =200a(8) =263a(9) =336a(10) =418a(11) =511a(12) =611a(13) =724a(14) =848a(15) =981a(16) =1125a(17) =1281a(18) =1446a(19) =1624a(20) =1811a(21) =2010a(22) =2220a(23) =2446a(24) =2676a(25) =2922a(26) =3178a(27) =3450a(28) =3730a(29) =4023