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Search: id:A072251
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| A072251 |
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(3*a(n)+1)/2^(2*n + 1) = 23-6*n. |
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+0
1
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| 15, 45, 117, 213, -171, -4779, -35499, -207531, -1092267, -5417643, -25864875, -120236715, -548055723, -2460658347, -10916375211, -47960468139, -209021741739, -904806443691, -3894103681707, -16675926354603, -71101751929515, -301999193762475, -1278365519227563
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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Related to the Collatz conjecture.
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FORMULA
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a(n) = ((46-12*n)*4^n-1)/3. - Don Reble (djr(AT)nk.ca), Oct 31 2005
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CROSSREFS
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Sequence in context: A060536 A014634 A126228 this_sequence A002756 A039450 A127069
Adjacent sequences: A072248 A072249 A072250 this_sequence A072252 A072253 A072254
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KEYWORD
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sign,easy,less
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AUTHOR
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N. Rathankar (rathankar(AT)yahoo.com), Jul 08 2002
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EXTENSIONS
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Edited and extended by David Wasserman (dwasserm(AT)earthlink.net), Dec 27 2006
Corrected by N. J. A. Sloane (njas(AT)research.att.com), Mar 01 2007
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