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A072257
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((6n-17)*4^n-1)/3.
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5
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-6, -15, -27, 21, 597, 4437, 25941, 136533, 677205, 3233109, 15029589, 68506965, 307582293, 1364546901, 5995058517, 26127717717, 113100805461, 486762960213, 2084490794325, 8887718991189
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| Related to Collatz function (for n>2). All divisible by 3.
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (9,-24,16).
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FORMULA
| G.f.: -3*(2-13*x+12*x^2)/((1-x)*(1-4*x)^2). - Bruno Berselli, Dec 16 2011
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CROSSREFS
| Cf. A072258, A072259, A072260.
Sequence in context: A008440 A022601 A112150 * A140091 A171972 A165454
Adjacent sequences: A072254 A072255 A072256 * A072258 A072259 A072260
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KEYWORD
| sign,easy
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AUTHOR
| N. Rathankar (rathankar(AT)yahoo.com), Jul 08 2002
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EXTENSIONS
| Edited and extended by Henry Bottomley (se16(AT)btinternet.com), Aug 06 2002
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