Beatty sequence for 1+sqrt(2); a(n) = floor(n*(1+sqrt(2))).

Terms

a(0) =2a(1) =4a(2) =7a(3) =9a(4) =12a(5) =14a(6) =16a(7) =19a(8) =21a(9) =24a(10) =26a(11) =28a(12) =31a(13) =33a(14) =36a(15) =38a(16) =41a(17) =43a(18) =45a(19) =48a(20) =50a(21) =53a(22) =55a(23) =57a(24) =60a(25) =62a(26) =65a(27) =67a(28) =70a(29) =72