cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A023445 n-3.

Original entry on oeis.org

-3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55
Offset: 0

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Comments

For n >= 0, let M(n) be the matrix with first row = (n n+1) and 2nd row = (n+3 n+5). Then a(n) = det(M(n)). [From K.V.Iyer, Apr 11 2009]

Crossrefs

Programs

  • Mathematica
    Range[0,60]-3 (* Harvey P. Dale, Dec 09 2017 *)
  • PARI
    a(n)=n-3

Formula

a(n) = 2 a(n-1) - a(n-2). a(n) = -A022959(n). G.f.: (-3 + 4*x)/(1 - x)^2. - M. F. Hasler, Apr 18 2015

A023447 a(n) = n-5.

Original entry on oeis.org

-5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53
Offset: 0

Views

Author

Keywords

Crossrefs

Programs

  • Mathematica
    Range[0,60]-5 (* Harvey P. Dale, Feb 01 2016 *)
  • PARI
    a(n)=n-5

Formula

a(n) = 2 a(n-1) - a(n-2). a(n) = -A022961(n). G.f.: (-5+6*x)/(1-x)^2. - M. F. Hasler, Apr 18 2015
Showing 1-2 of 2 results.