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A072260
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((6n+19)*4^n-1)/3.
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5
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6, 33, 165, 789, 3669, 16725, 75093, 333141, 1463637, 6378837, 27612501, 118838613, 508908885, 2169853269, 9216283989, 39012619605, 164640413013, 692921390421, 2909124515157
(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>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*(2-7*x+4*x^2)/((1-x)*(1-4*x)^2). - Bruno Berselli, Dec 16 2011
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CROSSREFS
| Cf. A072257, A072258, A072259.
Sequence in context: A074087 A022730 A099432 * A203155 A084153 A086314
Adjacent sequences: A072257 A072258 A072259 * A072261 A072262 A072263
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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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