0*9, 1*8, 2*7, 3*6, 4*5; 10*19, 11*18, ..., 14*15; 20*29, 21*28, ..., 24*25; 30*39, ...

Terms

a(0) =0a(1) =8a(2) =14a(3) =18a(4) =20a(5) =190a(6) =198a(7) =204a(8) =208a(9) =210a(10) =580a(11) =588a(12) =594a(13) =598a(14) =600a(15) =1170a(16) =1178a(17) =1184a(18) =1188a(19) =1190a(20) =1960a(21) =1968a(22) =1974a(23) =1978a(24) =1980a(25) =2950a(26) =2958a(27) =2964a(28) =2968a(29) =2970