A011876 a(n) = floor(n*(n-1)/23).

0, 0, 0, 0, 0, 0, 1, 1, 2, 3, 3, 4, 5, 6, 7, 9, 10, 11, 13, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 35, 37, 40, 43, 45, 48, 51, 54, 57, 61, 64, 67, 71, 74, 78, 82, 86, 90, 94, 98, 102, 106, 110, 115, 119, 124, 129, 133, 138, 143, 148, 153, 159, 164, 169, 175, 180, 186, 192, 198

Offset

0,9

Links

Paolo Xausa, Table of n, a(n) for n = 0..10000

Index entries for linear recurrences with constant coefficients, signature (2,-1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,-2,1).

Formula

a(n) = +2*a(n-1) -a(n-2) +a(n-23) -2*a(n-24) +a(n-25). - R. J. Mathar, Apr 15 2010

G.f: -((x^6 (1+x^2) (1+(-1+x) x (1+x) (1+(-1+x) x) (1+x+x^7)))/(-1+x (2+x (-1+(-1+x)^2 x^21)))). - Peter J. C. Moses, Jun 01 2014

Mathematica

A011876[n_] := Quotient[n*(n-1), 23]; Array[A011876, 100, 0] (* Paolo Xausa, Jun 05 2026 *)

Crossrefs

Sequence in context: A029037 A017875 A039732 * A029036 A192530 A281744

Adjacent sequences: A011873 A011874 A011875 * A011877 A011878 A011879

Keyword

nonn,easy,changed

Author

N. J. A. Sloane

Status

approved