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0, 11, 40, 87, 152, 235, 336, 455, 592, 747, 920, 1111, 1320, 1547, 1792, 2055, 2336, 2635, 2952, 3287, 3640, 4011, 4400, 4807, 5232, 5675, 6136, 6615, 7112, 7627, 8160, 8711, 9280, 9867, 10472, 11095, 11736, 12395, 13072, 13767, 14480, 15211, 15960
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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LINKS
| Reply to V. Librandi, A147296 (SeqFan list) [From M. F. Hasler, Mar 01 2009]
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FORMULA
| a(n) = n*(9*n + 2), as conjectured by V. Librandi. - From M. F. Hasler, Mar 01 2009
G.f.: x*(11+7*x)/(1-x)^3. - Jaume Oliver Lafont, Aug 30 2009
a(n) = floor((3*n + 1/3)^2). - Reinhard Zumkeller, Apr 14 2010
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PROG
| (PARI) A147296(n) = n*(9*n + 2) [From M. F. Hasler, Mar 01 2009]
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CROSSREFS
| Equals first 9-fold decimation of A144454.
Cf. A010701, A017173 [From Vincenzo Librandi, Mar 11 2009]
Cf. A185019.
Sequence in context: A077568 A122014 A031427 * A059142 A064798 A056124
Adjacent sequences: A147293 A147294 A147295 * A147297 A147298 A147299
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KEYWORD
| nonn,easy
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AUTHOR
| Paul Curtz (bpcrtz(AT)free.fr), Nov 05 2008
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EXTENSIONS
| More terms from M. F. Hasler, Mar 01 2009
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