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26, 51, 76, 101, 126, 151, 176, 201, 226, 251, 276, 301, 326, 351, 376, 401, 426, 451, 476, 501, 526, 551, 576, 601, 626, 651, 676, 701, 726, 751, 776, 801, 826, 851, 876, 901, 926, 951, 976, 1001, 1026, 1051, 1076, 1101, 1126, 1151, 1176, 1201, 1226, 1251
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 1..10000
Index to sequences with linear recurrences with constant coefficients, signature (2,-1).
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FORMULA
| a(n) = 2*a(n-1) -a(n-2).
G.f.: x*(26-x)/(x-1)^2.
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MATHEMATICA
| LinearRecurrence[{2, -1}, {26, 51}, 50]
Range[26, 2000, 25] (* From Vladimir Joseph Stephan Orlovsky, Jun 14 2011 *)
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PROG
| (MAGMA) I:=[26, 51]; [n le 2 select I[n] else 2*Self(n-1)-Self(n-2): n in [1..60]];
(PARI) a(n)=25*n+1 \\ Charles R Greathouse IV, Jun 14 2011
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CROSSREFS
| Sequence in context: A137263 A044078 A044459 * A169861 A122999 A040650
Adjacent sequences: A158057 A158058 A158059 * A158061 A158062 A158063
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KEYWORD
| nonn,easy
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AUTHOR
| Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Mar 12 2009
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