PROG
(MAGMAMagma) [13*n*(2*n-1): n in [0..50]]; // Vincenzo Librandi, Oct 03 2011
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(MAGMAMagma) [13*n*(2*n-1): n in [0..50]]; // Vincenzo Librandi, Oct 03 2011
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Sequence found by reading the line from 0, in the direction 0, 13, ..., in the square spiral whose vertices are the generalized 15-gonal numbers.
a(0)=0, a(n) = a(n-1) + 52*n - 39, a(0)=0. - Vincenzo Librandi, Oct 03 2011
(MAGMA) [13*n*(2*n-1): n in [0..50]]; // _Vincenzo Librandi, _, Oct 03 2011
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<a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (3,-3,1).
a(0)=0, a(n) = a(n-1)+52*n-39. - _Vincenzo Librandi, _, Oct 03 2011
(PARI) a(n)=13*n*(2*n-1) \\ Charles R Greathouse IV, Jun 17 2017
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_Omar E. Pol (info(AT)polprimos.com), _, Oct 02 2011
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Vincenzo Librandi, <a href="/A194713/b194713.txt">Table of n, a(n) for n = 0..10000</a>
a(0)=0, a(n) = a(n-1)+52*n-39. - Vincenzo Librandi, Oct 03 2011
(MAGMA) [13*n*(2*n-1): n in [0..50]]; // Vincenzo Librandi, Oct 03 2011
approved
editing