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A027742 phi(4^n-1)/(2*n). 0
1, 2, 6, 16, 60, 144, 756, 2048, 7776, 24000, 120032, 276480, 1719900, 4741632, 17820000, 67108864, 336849900, 725594112, 4822382628, 11842560000, 57802864896, 200778006528, 998132265920, 2283043553280 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

CROSSREFS

Cf. A027695.

Sequence in context: A073959 A006820 A131385 * A033301 A197102 A093113

Adjacent sequences:  A027739 A027740 A027741 * A027743 A027744 A027745

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified February 15 23:53 EST 2012. Contains 205860 sequences.