a(n) = reverse(10*n - a(n-1)), with n>1, a(1) = 1.

Terms

a(0) =1a(1) =91a(2) =-16a(3) =65a(4) =-51a(5) =111a(6) =-14a(7) =49a(8) =14a(9) =68a(10) =24a(11) =69a(12) =16a(13) =421a(14) =-172a(15) =233a(16) =-36a(17) =612a(18) =-224a(19) =424a(20) =-412a(21) =236a(22) =-6a(23) =642a(24) =-293a(25) =355a(26) =-58a(27) =833a(28) =-345a(29) =546