1,2

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).

J. Riordan, An Introduction to Combinatorial Analysis, Wiley, 1958, p. 159.

Sequence in context: A062478 A005430 A094434 this_sequence A074445 A038154 A061834

Adjacent sequences: A001571 A001572 A001573 this_sequence A001575 A001576 A001577

nonn

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