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This is A100982 with 1 prepended.
Table of n, a(n) for n=1..32.
Index entries for sequences related to 3x+1 (or Collatz) problem
Sequence in context: A047749 A134565 A100982 * A034786 A080107 A056156
Adjacent sequences: A186006 A186007 A186008 * A186010 A186011 A186012
T. D. Noe, Feb 09 2011