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A139302
2^(2p - 1)/16, where p is a Mersenne prime A000668(n).
3
2, 512, 144115188075855872
OFFSET
1,1
FORMULA
a(n) = 2^(2*A000668(n)-1)/16 = A139294(n)/16.
CROSSREFS
Sequence in context: A109111 A004886 A234606 * A003391 A294276 A320520
KEYWORD
bref,nonn
AUTHOR
Omar E. Pol, Apr 13 2008
STATUS
approved