Nearest integer to n*sqrt(2).

Terms

a(0) =0a(1) =1a(2) =3a(3) =4a(4) =6a(5) =7a(6) =8a(7) =10a(8) =11a(9) =13a(10) =14a(11) =16a(12) =17a(13) =18a(14) =20a(15) =21a(16) =23a(17) =24a(18) =25a(19) =27a(20) =28a(21) =30a(22) =31a(23) =33a(24) =34a(25) =35a(26) =37a(27) =38a(28) =40a(29) =41