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.

Adjacent sequences: A007053 A007054 A007055 this_sequence A007057 A007058 A007059

Sequence in context: A111209 A109755 A005254 this_sequence A026551 A060578 A004667

nonn

njas, Mira Bernstein, R. Kemp