a(n) = floor(n*phi^20), where phi is the golden ratio, A001622.

Terms

a(0) =0a(1) =15126a(2) =30253a(3) =45380a(4) =60507a(5) =75634a(6) =90761a(7) =105888a(8) =121015a(9) =136142a(10) =151269a(11) =166396a(12) =181523a(13) =196650a(14) =211777a(15) =226904a(16) =242031a(17) =257158a(18) =272285a(19) =287412a(20) =302539a(21) =317666a(22) =332793a(23) =347920a(24) =363047a(25) =378174