Least number of squares that add up to n.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =1a(5) =2a(6) =3a(7) =4a(8) =2a(9) =1a(10) =2a(11) =3a(12) =3a(13) =2a(14) =3a(15) =4a(16) =1a(17) =2a(18) =2a(19) =3a(20) =2a(21) =3a(22) =3a(23) =4a(24) =3a(25) =1a(26) =2a(27) =3a(28) =4a(29) =2