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A059138 A hierarchical sequence (S(W3{2,2}cc) - see A059126). 0
18, 90, 270, 666, 1494, 3186, 6606, 13482, 27270, 54882, 110142, 220698, 441846, 884178, 1768878 (list; graph; refs; listen; history; internal format)
OFFSET

0,1

LINKS

J. Wallgren, Hierarchical sequences

CROSSREFS

Sequence in context: A141842 A063788 A066854 * A117735 A041624 A174075

Adjacent sequences:  A059135 A059136 A059137 * A059139 A059140 A059141

KEYWORD

easy,nonn

AUTHOR

Jonas Wallgren (jonwa(AT)ida.liu.se), Jan 19 2001

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Last modified February 17 09:41 EST 2012. Contains 206009 sequences.