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A054554
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4*n^2 -10*n + 7.
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11
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1, 3, 13, 31, 57, 91, 133, 183, 241, 307, 381, 463, 553, 651, 757, 871, 993, 1123, 1261, 1407, 1561, 1723, 1893, 2071, 2257, 2451, 2653, 2863, 3081, 3307, 3541, 3783, 4033, 4291, 4557, 4831, 5113, 5403, 5701, 6007, 6321, 6643, 6973, 7311, 7657, 8011, 8373
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Move in 1-3 direction in a spiral organized like A068225 etc.
Ulam's spiral (NE spoke). - Robert G. Wilson v, Oct 31 2011
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LINKS
| Index entries for sequences related to linear recurrences with constant coefficients, signature (3,-3,1).
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FORMULA
| Equals binomial transform of [1, 2, 8, 0, 0, 0,...]. - Gary W. Adamson (qntmpkt(AT)yahoo.com), May 03 2008
a(n)=8*n+a(n-1)-14 (with a(1)=1) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 07 2010]
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MATHEMATICA
| f[n_] := 4n^2 -10n + 7; Array[f, 40] [From Vladimir Orlovsky, Sep 01 2008]
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CROSSREFS
| Cf. A054553, A068225, A054552, A054556, A054567, A054569, A033951.
Sequence in context: A179026 A179027 A145907 * A051939 A146728 A082709
Adjacent sequences: A054551 A054552 A054553 * A054555 A054556 A054557
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KEYWORD
| easy,nonn
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AUTHOR
| Enoch Haga, G. L. Honaker, Jr. (Enokh(AT)comcast.net), Apr 10 2000
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EXTENSIONS
| Edited by Frank Ellermann, Feb 24 2002
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