



21, 21, 21, 42, 42, 42, 84, 84, 84, 168, 168, 168, 336, 336, 336, 672, 672, 672, 1344, 1344, 1344, 2688, 2688, 2688, 5376, 5376, 5376, 10752, 10752, 10752, 21504, 21504, 21504, 43008, 43008, 43008, 86016, 86016, 86016, 172032, 172032, 172032, 344064
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OFFSET

0,1


COMMENTS

a(n) divided by 21 is the sequence 1,1,1,2,2,2,4,4,4,.., that is A000079 triplicated.


LINKS

Table of n, a(n) for n=0..42.


CROSSREFS

Sequence in context: A154352 A291433 A010860 * A151910 A040421 A022355
Adjacent sequences: A158769 A158770 A158771 * A158773 A158774 A158775


KEYWORD

nonn,less


AUTHOR

Paul Curtz, Mar 26 2009


EXTENSIONS

Edited by R. J. Mathar, May 17 2009


STATUS

approved



