1,1
R. L. Graham, D. E. Knuth and O. Patashnik, Concrete Mathematics. Addison-Wesley, Reading, MA, 1990, p. 254.
J. Riordan, An Introduction to Combinatorial Analysis, Wiley, 1958, p. 125.
N. J. A. Sloane, An on-line version of the Encyclopedia of Integer Sequences, Electronic J. Combinatorics, Vol. 1, no. 1, 1994.
Sequence in context: A067107 A047690 A113569 this_sequence A046857 A129454 A140258
Adjacent sequences: A007335 A007336 A007337 this_sequence A007339 A007340 A007341
nonn
njas
Last term corrected Mar 15 1997 by Olivier Gerard.
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