1015565

Appears in sequences

• Let S denote the palindromes in the language {0,1,2,3,4}*; a(n) = number of words of length n in the language SS.at n=13A007058
• Number of 6-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero and first and second differences in -n..n.at n=29A208973