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A072258
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((6n+1)*4^n-1)/3.
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4
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0, 9, 69, 405, 2133, 10581, 50517, 234837, 1070421, 4805973, 21321045, 93672789, 408245589, 1767200085, 7605671253, 32570168661, 138870609237, 589842175317, 2496807654741, 10536986432853
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Related to Collatz function (for n>0). 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*x*(3-4*x)/((1-x)*(1-4*x)^2). - Bruno Berselli, Dec 16 2011
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CROSSREFS
| Cf. A072257, A072259, A072260.
Sequence in context: A089379 A193698 A188800 * A196490 A198691 A125372
Adjacent sequences: A072255 A072256 A072257 * A072259 A072260 A072261
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KEYWORD
| nonn,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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