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A144555
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a(n) = 14*n^2.
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16
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0, 14, 56, 126, 224, 350, 504, 686, 896, 1134, 1400, 1694, 2016, 2366, 2744, 3150, 3584, 4046, 4536, 5054, 5600, 6174, 6776, 7406, 8064, 8750, 9464, 10206, 10976, 11774, 12600, 13454, 14336, 15246, 16184, 17150, 18144, 19166, 20216, 21294, 22400, 23534, 24696
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Sequence found by reading the line from 0, in the direction 0, 14,..., in the square spiral whose vertices are the generalized enneagonal numbers A118277. Also sequence found by reading the same line and direction in the square spiral whose edges have length A195019 and whose vertices are the numbers A195020. - Omar E. Pol, Sep 10 2011
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FORMULA
| a(n) = A000290(n)*14 = A001105(n)*7 = A033582(n)*2. [From Omar E. Pol (info(AT)polprimos.com), Jan 01 2009]
a(n)=a(n-1)+14*(2*n-1) (with a(0)=0) [From Vincenzo Librandi, Nov 25 2010]
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CROSSREFS
| Cf. A000290, A001105, A033582, A064761, A152742. [From Omar E. Pol (info(AT)polprimos.com), Jan 01 2009]
Sequence in context: A140784 A022285 A100157 * A192846 A115129 A067326
Adjacent sequences: A144552 A144553 A144554 * A144556 A144557 A144558
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Jan 01 2009
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