The odd numbers 1 3 5 7 are increased by 11 each time
While the even numbers 2 4 6 are halved each time.
I guess you could write the sequence like this: S(n) = If n odd, then (n+3)*11; If n even, then n/2
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22, 33, 44, 55, 66, 77, 88, 99
11, 22, 33, 44, 55, 66, 77, 88, 99, . . .
66
There are nine two-digit palindromes: 11, 22, 33, 44, 55, 66, 77, 88 and 99.
11, 22, 33, 44, 55, 66, 77, 88, 99, 110, 121, 132, 143, 154, 165, 176, 187, 198...