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A072259
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((6n+37)*4^n-1)/3.
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4
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12, 57, 261, 1173, 5205, 22869, 99669, 431445, 1856853, 7951701, 33903957, 144004437, 609572181, 2572506453, 10826896725, 45455070549, 190410216789, 796000605525, 3321441375573
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OFFSET
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0,1
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COMMENTS
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Related to Collatz function (for n>0). All divisible by 3.
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LINKS
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Table of n, a(n) for n=0..18.
Index to sequences with linear recurrences with constant coefficients, signature (9,-24,16).
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FORMULA
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G.f.: 3*(4-17*x+12*x^2)/((1-x)*(1-4*x)^2). - Bruno Berselli, Dec 16 2011
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CROSSREFS
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Cf. A072257, A072258, A072260.
Sequence in context: A212065 A121693 A190297 * A167533 A062477 A048362
Adjacent sequences: A072256 A072257 A072258 * A072260 A072261 A072262
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KEYWORD
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nonn,easy
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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 Henry Bottomley, Aug 06 2002
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STATUS
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approved
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