The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A055305 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A055305

Number of labeled rooted trees with n nodes and 4 leaves.
(history; published version)

#15 by Charles R Greathouse IV at Thu Sep 08 08:45:01 EDT 2022

PROG

(MAGMAMagma) [Factorial(n)*(n-4)^2*(n-3)^2*(n-2)*(n-1)/1152 : n in [5..25]]; // Vincenzo Librandi, Jul 25 2014

Discussion

Thu Sep 08

08:45

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

#14 by Bruno Berselli at Fri Jul 25 13:41:10 EDT 2014

STATUS

reviewed

approved

#13 by Joerg Arndt at Fri Jul 25 13:39:51 EDT 2014

STATUS

proposed

reviewed

#12 by Vincenzo Librandi at Fri Jul 25 13:19:18 EDT 2014

STATUS

editing

proposed

#11 by Vincenzo Librandi at Fri Jul 25 13:19:06 EDT 2014

LINKS

<a href="/index/Ro#rooted">Index entries for sequences related to rooted trees</a>

#10 by Vincenzo Librandi at Fri Jul 25 13:18:39 EDT 2014

LINKS

Vincenzo Librandi, <a href="/A055305/b055305.txt">Table of n, a(n) for n = 5..200</a>

PROG

(MAGMA) [Factorial(n)*(n-4)^2*(n-3)^2*(n-2)*(n-1)/1152 : n in [5..25]]; // Vincenzo Librandi, Jul 25 2014

STATUS

approved

editing

#9 by Vaclav Kotesovec at Fri Jul 25 10:50:33 EDT 2014

STATUS

editing

approved

#8 by Vaclav Kotesovec at Fri Jul 25 10:50:25 EDT 2014

FORMULA

a(n) = n! * (n-4)^2*(n-3)^2*(n-2)*(n-1)/1152. - Vaclav Kotesovec, Jul 25 2014

MATHEMATICA

Table[n! * (n-4)^2*(n-3)^2*(n-2)*(n-1)/1152, {n, 5, 20}] (* Vaclav Kotesovec, Jul 25 2014 *)

STATUS

approved

editing

#7 by Russ Cox at Fri Mar 30 17:37:10 EDT 2012

AUTHOR

_Christian G. Bower (bowerc(AT)usa.net), _, May 11 2000

Discussion

Fri Mar 30

17:37

OEIS Server: https://oeis.org/edit/global/178

#6 by Russ Cox at Sun Jul 10 18:22:47 EDT 2011

LINKS

<a href="/Sindx_index/Ro.html#rooted">Index entries for sequences related to rooted trees</a>

Discussion

Sun Jul 10

18:22

OEIS Server: https://oeis.org/edit/global/79