Dear Seqfans, Who is able to find rule for pairs (n,x) {{5, 483}, {6, 667}, {7, 899}, {8, 1155}, {9, 1443}, {10, 1763}, {11, 2091}} a(5)=482, a(6)=667, ... another words sequence is 483, 667, 899, 1155, 1443, 1763, 2091 and offset is 5 I will be greatfull for any help! Best wishes Artur