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A139240 First differences of Mersenne numbers A001348, divided by 4. 4
1, 6, 24, 480, 1536, 30720, 98304, 1966080, 132120576 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

FORMULA

a(n) = 139238(n)/4 = A139239(n)/2.

CROSSREFS

Cf. A001348, A139237, A139238, A139239, A139243.

Sequence in context: A097171 A152886 A128614 * A052524 A036284 A139235

Adjacent sequences:  A139237 A139238 A139239 * A139241 A139242 A139243

KEYWORD

easy,nonn

AUTHOR

Omar E. Pol (info(AT)polprimos.com), Apr 19 2008

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Last modified February 16 09:50 EST 2012. Contains 205904 sequences.