a(n) = round(n*phi^4), where phi is the golden ratio, A001622.

Terms

a(0) =0a(1) =7a(2) =14a(3) =21a(4) =27a(5) =34a(6) =41a(7) =48a(8) =55a(9) =62a(10) =69a(11) =75a(12) =82a(13) =89a(14) =96a(15) =103a(16) =110a(17) =117a(18) =123a(19) =130a(20) =137a(21) =144a(22) =151a(23) =158a(24) =164a(25) =171a(26) =178a(27) =185a(28) =192a(29) =199