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A011867
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Floor(n*(n-1)/14).
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2
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0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 9, 11, 13, 15, 17, 19, 21, 24, 27, 30, 33, 36, 39, 42, 46, 50, 54, 58, 62, 66, 70, 75, 80, 85, 90, 95, 100, 105, 111, 117, 123, 129, 135, 141, 147, 154, 161, 168, 175, 182, 189, 196, 204, 212, 220, 228, 236, 244, 252, 261, 270, 279, 288, 297
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,7
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (2,-1,0,0,0,0,1,-2,1).
Vincenzo Librandi, Table of n, a(n) for n = 0..10000
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FORMULA
| a(n) = +2*a(n-1) -a(n-2) +a(n-7) -2*a(n-8) +a(n-9). G.f.: x^5 / ((1-x)^3*(x^6+x^5+x^4+x^3+x^2+x+1) ). [From R. J. Mathar, Apr 15 2010]
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MATHEMATICA
| Table[Floor[n(n - 1)/14], {n, 0, 59}] (* From Alonso del Arte, Aug 26 2011 *)
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PROG
| (MAGMA) [Floor(n*(n-1)/14): n in [0..70]]; // Vincenzo Librandi, Aug 29 2011
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CROSSREFS
| Cf. A174738.
Sequence in context: A033059 A031876 A174738 * A008725 A026445 A030151
Adjacent sequences: A011864 A011865 A011866 * A011868 A011869 A011870
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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