Can someone help me determine the recursive equation for all binary strings that are palindromes? A binary string is a palindrome if it reads the same forward and backward. Examples of such palindromes are $01100110$ and $101101$.
2026-03-25 17:16:53.1774459013
Recursive equation for binary palindromes
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Does it have to be recursive? $$a_n=2^{\left\lceil n/2\right\rceil}$$
I suppose you could say $a_n=2a_{n-2}$, by putting the palindrome of length $n-2$ in the middle, and either putting 1's or 0's on either end.