a(n) = n - reversal of base 7 digits of n (written in base 10).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =6a(8) =0a(9) =-6a(10) =-12a(11) =-18a(12) =-24a(13) =-30a(14) =12a(15) =6a(16) =0a(17) =-6a(18) =-12a(19) =-18a(20) =-24a(21) =18a(22) =12a(23) =6a(24) =0a(25) =-6a(26) =-12a(27) =-18a(28) =24a(29) =18