0,2

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, Tables of coefficients for obtaining central differences from their derivatives, Journal of Mathematics and Physics, 42 (1963), 162-165. Note that there is a mistake in the definition of this sequence on line 2 of page 164.

(PARI) a(n)=4^n*(2*n+1)!

A002671(n) = A002866(2n+1).

Sequence in context: A166788 A123794 A006685 this_sequence A003738 A001501 A054005

Adjacent sequences: A002668 A002669 A002670 this_sequence A002672 A002673 A002674

nonn,easy

N. J. A. Sloane (njas(AT)research.att.com), Simon Plouffe (simon.plouffe(AT)gmail.com)

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