2,1
J. Riordan, An Introduction to Combinatorial Analysis, Wiley, 1958, p. 142.
Sequence in context: A005040 A026577 A111643 this_sequence A117616 A014445 A113440
Adjacent sequences: A000160 A000161 A000162 this_sequence A000164 A000165 A000166
nonn
njas
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