The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A011925 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A011925

a(n) = floor(n*(n-1)*(n-2)*(n-3)/15).
(history; published version)

#28 by Charles R Greathouse IV at Thu Sep 08 08:44:37 EDT 2022

PROG

(MAGMAMagma) [Floor(n*(n-1)*(n-2)*(n-3)/15): n in [0..45]]; // Vincenzo Librandi, Jun 19 2012

Discussion

Thu Sep 08

08:44

OEIS Server: https://oeis.org/edit/global/2944

#27 by Jon E. Schoenfield at Mon Dec 27 22:32:22 EST 2021

STATUS

reviewed

approved

#26 by Michel Marcus at Mon Dec 27 22:24:09 EST 2021

STATUS

proposed

reviewed

#25 by Wesley Ivan Hurt at Mon Dec 27 22:10:32 EST 2021

STATUS

editing

proposed

#24 by Wesley Ivan Hurt at Mon Dec 27 22:10:25 EST 2021

LINKS

<a href="/index/Rec#order_09">Index entries for linear recurrences with constant coefficients</a>, signature (4,-6,4,-1,1,-4,6,-4,1).

STATUS

proposed

editing

#23 by Jon E. Schoenfield at Mon Dec 27 22:08:17 EST 2021

STATUS

editing

proposed

#22 by Jon E. Schoenfield at Mon Dec 27 22:08:13 EST 2021

NAME

Floora(n) = floor(n*(n-1)*(n-2)*(n-3)/15).

FORMULA

From R. J. Mathar, Apr 15 2010: (Start)

a(n) = +4*a(n-1) - 6*a(n-2) + 4*a(n-3) - a(n-4) + a(n-5) - 4*a(n-6) + 6*a(n-7) - 4*a(n-8) + a(n-9). G.f.: x^4*(x^4+4*x^3-2*x^2+4*x+1) / ( (1-x)^5*(x^4+x^3+x^2+x+1) ). [_R. J. Mathar_, Apr 15 2010]

G.f.: x^4*(x^4 + 4*x^3 - 2*x^2 + 4*x + 1) / ( (1-x)^5*(x^4 + x^3 + x^2 + x + 1) ). (End)

AUTHOR

N. J. A. Sloane.

STATUS

approved

editing

#21 by Charles R Greathouse IV at Sat Jun 13 00:48:28 EDT 2015

LINKS

<a href="/index/Rec">Index to sequences with entries for linear recurrences with constant coefficients</a>, signature (4,-6,4,-1,1,-4,6,-4,1).

Discussion

Sat Jun 13

00:48

OEIS Server: https://oeis.org/edit/global/2439

#20 by Charles R Greathouse IV at Fri Jun 12 15:23:14 EDT 2015

LINKS

<a href="/index/Rea#recLCCRec">Index to sequences with linear recurrences with constant coefficients</a>, signature (4,-6,4,-1,1,-4,6,-4,1).

Discussion

Fri Jun 12

15:23

OEIS Server: https://oeis.org/edit/global/2436

#19 by Joerg Arndt at Sun Feb 02 10:28:01 EST 2014

STATUS

proposed

approved