30136

Appears in sequences

• Let S denote the palindromes in the language {0,1}*; a(n) = number of words of length n in the language SS.at n=20A007055
• a(n) = n*(16*n^2 - 21*n + 7)/2.at n=16A260260
• a(n) = Sum_{-n<i<n, -n<j<n, gcd{i,j}=2} (n-|i|)*(n-|j|).at n=20A331772