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A kind of core or backbone of A145511, A145501 and A145444.
Table of n, a(n) for n=0..97.
Sequence in context: A100026 A100049 A261926 * A134059 A219915 A219217
Adjacent sequences: A158312 A158313 A158314 * A158316 A158317 A158318
Paul Curtz, Mar 16 2009
Edited and extended by R. J. Mathar, Apr 04 2009