login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A055504 n*(n-1)*(n-2)*(n-3)*(n-4)*(2*n-1)/72. 1
0, 0, 0, 0, 0, 15, 110, 455, 1400, 3570, 7980, 16170, 30360, 53625, 90090, 145145, 225680, 340340, 499800, 717060, 1007760, 1390515, 1887270, 2523675, 3329480, 4338950, 5591300, 7131150, 9009000, 11281725, 14013090, 17274285, 21144480 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,6
REFERENCES
L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 73, Problem 3.
LINKS
FORMULA
G.f.: 5*x^5*(3+x)/(1-x)^7. [Colin Barker, May 09 2012]
CROSSREFS
Sequence in context: A232197 A347500 A205352 * A060931 A107585 A205347
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Jul 10 2000
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 19 02:58 EDT 2024. Contains 370952 sequences. (Running on oeis4.)