1,1

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

D. Shanks, Generalized Euler and class numbers, Math. Comp. 21 (1967), 689-694; 22 (1968), 699.

Sequence in context: A013975 A103520 A003395 this_sequence A121835 A159531 A029590

Adjacent sequences: A000408 A000409 A000410 this_sequence A000412 A000413 A000414

nonn

N. J. A. Sloane (njas(AT)research.att.com).