2,2

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).

H. E. Salzer, Coefficients for numerical differentiation with central differences, J. Math. Phys., 22 (1943), 115-135.

T. R. Van Oppolzer, Lehrbuch zur Bahnbestimmung der Kometen und Planeten, Vol. 2, Engelmann, Leipzig, 1880, p. 21.

Sequence in context: A064204 A054644 A006434 this_sequence A068204 A001332 A071304

Adjacent sequences: A002699 A002700 A002701 this_sequence A002703 A002704 A002705

nonn

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