a(n) = Product_{j=0..5} floor((n+j)/6).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =1a(7) =2a(8) =4a(9) =8a(10) =16a(11) =32a(12) =64a(13) =96a(14) =144a(15) =216a(16) =324a(17) =486a(18) =729a(19) =972a(20) =1296a(21) =1728a(22) =2304a(23) =3072a(24) =4096a(25) =5120a(26) =6400a(27) =8000a(28) =10000a(29) =12500