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R. P. Stanley, Enumerative Combinatorics, Cambridge, Vol. 2, 1999; see page 191.
Table of n, a(n) for n=0..15.
Sequence in context: A029995 A244352 A173987 * A165518 A127776 A266524
Adjacent sequences: A052141 A052142 A052143 * A052145 A052146 A052147
N. J. A. Sloane, Jan 23 2000