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Table of n, a(n) for n=0..21.
Cf. A000273, A000664.
Sequence in context: A149747 A149748 A151494 * A151882 A149749 A149750
Adjacent sequences: A053415 A053416 A053417 * A053419 A053420 A053421
Vladeta Jovovic, Jan 10 2000
Edited and extended by Max Alekseyev, Sep 18 2009