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Table of n, a(n) for n=0..26.
Cf. A046318, A046375.
Sequence in context: A206471 A172783 A252886 * A156417 A156865 A233681
Adjacent sequences: A046404 A046405 A046406 * A046408 A046409 A046410
Patrick De Geest, Jun 15 1998.