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A139243 Second differences of Mersenne numbers A001348, divided by 4. 4
5, 18, 456, 1056, 29184, 67584, 1867776, 130154496 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

FORMULA

a(n) = 139241(n)/4 = A139242(n)/2.

CROSSREFS

Cf. A001348, A139237, A139239, A139240, A139241, A139242.

Sequence in context: A204252 A091059 A203180 * A139237 A089082 A106229

Adjacent sequences:  A139240 A139241 A139242 * A139244 A139245 A139246

KEYWORD

easy,nonn

AUTHOR

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

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