0,2

R. Kemp, On the number of words in the language {w in Sigma* | w = w^R }^2, Discrete Math., 40 (1982), 225-234.

Sequence in context: A051505 A101434 A008382 this_sequence A072207 A033860 A115909

Adjacent sequences: A007052 A007053 A007054 this_sequence A007056 A007057 A007058

nonn

njas, Mira Bernstein, R. Kemp