This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A100451 a(n) = 0 for n <= 2; for n >= 3, a(n) = (n-2)*floor((n^2-2)/(n-2)). 4
 0, 0, 7, 14, 21, 32, 45, 60, 77, 96, 117, 140, 165, 192, 221, 252, 285, 320, 357, 396, 437, 480, 525, 572, 621, 672, 725, 780, 837, 896, 957, 1020, 1085, 1152, 1221, 1292, 1365, 1440, 1517, 1596, 1677, 1760, 1845, 1932, 2021, 2112, 2205, 2300, 2397, 2496, 2597, 2700 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..10000 FORMULA a(n) = (n-2)*(n+2), n>=5. [R. J. Mathar, Aug 17 2009] a(n) = A028347(n), n>=5. [From R. J. Mathar, Jul 31 2010] MATHEMATICA Join[{0, 0, 7, 14}, Table[(n-2)(n+2), {n, 5, 60}]] (* or *) Join[{0, 0, 7, 14}, LinearRecurrence[{3, -3, 1}, {21, 32, 45}, 60]] (* From Harvey P. Dale, Oct 03 2011 *) PROG (MAGMA)  [0, 0], [(n-2)*Floor((n^2-2)/(n-2)): n in [3..30]]; // Vincenzo Librandi, Oct 04 2011 CROSSREFS Third row of array in A100452. Sequence in context: A033004 A189931 A164005 * A028555 A061823 A018890 Adjacent sequences:  A100448 A100449 A100450 * A100452 A100453 A100454 KEYWORD nonn AUTHOR N. J. A. Sloane, Nov 22 2004 EXTENSIONS Factor in definition corrected by R. J. Mathar, Aug 17 2009 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .