a(n) = Product_{k=0..9} floor((n+k)/10).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =0a(9) =0a(10) =1a(11) =2a(12) =4a(13) =8a(14) =16a(15) =32a(16) =64a(17) =128a(18) =256a(19) =512a(20) =1024a(21) =1536a(22) =2304a(23) =3456a(24) =5184a(25) =7776a(26) =11664a(27) =17496a(28) =26244a(29) =39366