a(n) = floor(n*phi^18), where phi is the golden ratio, A001622.

Terms

a(0) =0a(1) =5777a(2) =11555a(3) =17333a(4) =23111a(5) =28889a(6) =34667a(7) =40445a(8) =46223a(9) =52001a(10) =57779a(11) =63557a(12) =69335a(13) =75113a(14) =80891a(15) =86669a(16) =92447a(17) =98225a(18) =104003a(19) =109781a(20) =115559a(21) =121337a(22) =127115a(23) =132893a(24) =138671a(25) =144449a(26) =150227