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D. Shanks, Generalized Euler and class numbers, Math. Comp. 21 (1967), 689-694; 22 (1968), 699.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Table of n, a(n) for n=0..13.
Sequence in context: A092662 A052811 A078603 * A078537 A145502 A072444
Adjacent sequences: A001584 A001585 A001586 * A001588 A001589 A001590
N. J. A. Sloane.