Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A019577
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A019577 Place n distinguishable balls in n boxes (in n^n ways); let f(n,k) = number of ways that max in any box is k, for 1<=k<=n; sequence gives f(n,2)/n. +0
1
0, 1, 6, 45, 420, 4800, 65520, 1045170, 19126800, 395448480, 9120988800, 232248416400, 6471820555200, 195912193276800, 6402199349145600, 224636583525354000, 8423131243022496000, 336138596955120960000 (list; graph; listen)
OFFSET

1,3

FORMULA

Sum n! (n-1)! / ( 2^d (n-2d)! d! d! ), d=1..[ n/2 ].

CROSSREFS

Cf. A019576.

Sequence in context: A135148 A137974 A001879 this_sequence A097814 A084064 A109516

Adjacent sequences: A019574 A019575 A019576 this_sequence A019578 A019579 A019580

KEYWORD

nonn,easy

AUTHOR

Lee Corbin (lcorbin(AT)tsoft.com), N. J. A. Sloane (njas(AT)research.att.com).

page 1

Search completed in 0.002 seconds

Lookup | Welcome | Find friends | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
More pages | Superseeker | Maintained by N. J. A. Sloane (njas@research.att.com)

Last modified November 25 08:46 EST 2009. Contains 167481 sequences.


AT&T Labs Research