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3, 12, 42, 123, 366, 1092, 3279, 9840, 29526, 88575, 265722, 797160, 2391483, 7174452, 21523362, 64570083, 193710246, 581130732, 1743392199, 5230176600, 15690529806, 47071589415, 141214768242, 423644304720, 1270932914163
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| Digital roots yield a hexaperiodic sequence A010888(a(n))= 3*A135265(n+1).
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (3,0,-1,3).
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FORMULA
| a(n)=3a(n-1)-a(n-3)+3a(n-4).
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CROSSREFS
| Sequence in context: A127120 A017940 A038342 * A084529 A017941 A066972
Adjacent sequences: A135261 A135262 A135263 * A135265 A135266 A135267
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KEYWORD
| nonn,less,easy
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AUTHOR
| Paul Curtz (bpcrtz(AT)free.fr), Dec 02 2007
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EXTENSIONS
| Edited, corrected and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 28 2008
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