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3, 8, 18, 38, 78, 158, 318, 638, 1278, 2558, 5118, 10238, 20478, 40958, 81918, 163838, 327678, 655358, 1310718, 2621438, 5242878, 10485758, 20971518, 41943038, 83886078, 167772158, 335544318, 671088638, 1342177278, 2684354558
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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FORMULA
| a(n) = A000079(n)*5 - 2 = A020714(n) - 2. [From Omar E. Pol (info(AT)polprimos.com), Dec 23 2008]
a(n)=2*(a(n-1)+1) with a(0)=3 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 06 2010]
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EXAMPLE
| a(5) = 5*2^4 - 2 = 80 - 2 = 78.
a(1)=2*(3+1)=8; a(2)=2*(8+1)=18; a(3)=2*(18+1)=38 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 06 2010]
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MATHEMATICA
| a=3; lst={a}; k=5; Do[a+=k; AppendTo[lst, a]; k+=k, {n, 0, 5!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Dec 15 2008]
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CROSSREFS
| a(n) = A118654(n, 5).
Cf. A000079, A020714. [From Omar E. Pol (info(AT)polprimos.com), Dec 23 2008]
Sequence in context: A006478 A104187 * A131051 A172265 A117727 A117713
Adjacent sequences: A051630 A051631 A051632 * A051634 A051635 A051636
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KEYWORD
| easy,nonn
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AUTHOR
| Asher Auel (asher.auel(AT)reed.edu)
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