a(0)=a(1)=1. a(n) = the multiple of n which is > a(n-1)+a(n-2) and is <= a(n-1)+a(n-2)+n.

Terms

a(0) =1a(1) =1a(2) =4a(3) =6a(4) =12a(5) =20a(6) =36a(7) =63a(8) =104a(9) =171a(10) =280a(11) =462a(12) =744a(13) =1209a(14) =1960a(15) =3180a(16) =5152a(17) =8347a(18) =13500a(19) =21850a(20) =35360a(21) =57225a(22) =92598a(23) =149845a(24) =242448a(25) =392300a(26) =634764a(27) =1027080a(28) =1661856a(29) =2688938