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Table of n, a(n) for n=1..68.
Cf. A111338, A006509.
Sequence in context: A164374 A072281 A242273 * A241028 A171097 A166460
Adjacent sequences: A111336 A111337 A111338 * A111340 A111341 A111342
Klaus Brockhaus, Nov 02 2005