login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A179456 Triangle read by rows: number of permutation trees of power n and height <= n - k. 3
1, 1, 2, 1, 6, 5, 1, 24, 23, 9, 1, 120, 119, 68, 14, 1, 720, 719, 517, 152, 20, 1, 5040, 5039, 4163, 1581, 292, 27, 1, 40320, 40319, 36180, 16776, 3917, 508, 35, 1, 362880, 362879, 341733, 186030, 52029, 8489, 823, 44, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Partial row sums of A179454 starting from the diagonal. Special case: A179456(n,n-2) = A000096(n) for n > 1.

LINKS

Table of n, a(n) for n=0..45.

Peter Luschny, Permutation trees.

EXAMPLE

1,

1,

2, 1,

6, 5, 1,

24, 23, 9, 1,

120, 119, 68, 14, 1,

720, 719, 517, 152, 20, 1,

5040, 5039, 4163, 1581, 292, 27, 1,

40320, 40319, 36180, 16776, 3917, 508, 35, 1,

362880, 362879, 341733, 186030, 52029, 8489, 823, 44, 1

CROSSREFS

Cf. A179454, A179455.

Sequence in context: A116395 A159924 A133367 * A214152 A121576 A121575

Adjacent sequences:  A179453 A179454 A179455 * A179457 A179458 A179459

KEYWORD

nonn,tabf

AUTHOR

Peter Luschny, Aug 11 2010

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy .

Last modified September 22 00:25 EDT 2017. Contains 292326 sequences.