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

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A120695 Set partitions reversed interpreted as base factorial numbers. 5
0, 1, 3, 5, 9, 15, 11, 17, 23, 33, 57, 39, 63, 87, 35, 59, 83, 41, 65, 89, 47, 71, 95, 119, 153, 273, 177, 297, 417, 159, 279, 399, 183, 303, 423, 207, 327, 447, 567, 155, 275, 395, 179, 299, 419, 203, 323, 443, 563, 161, 281, 401, 185, 305, 425, 209, 329, 449 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Alois P. Heinz, Rows n = 0..9, flattened

EXAMPLE

The third set partition is {1,2}, 21 in base factorial is 5, so a(3) = 5.

Triangle begins:

:  0;

:  1;

:  3,  5;

:  9, 15, 11, 17, 23;

: 33, 57, 39, 63, 87, 35, 59, 83, 41, 65, 89, 47, 71, 95, 119;

MAPLE

b:= proc(n, m, t) option remember; `if`(n=0, [0], [seq(map(

       x-> x+j*t!, b(n-1, max(m, j), t+1))[], j=1..m+1)])

    end:

T:= n-> b(n, 0, 1)[]:

seq(T(n), n=0..5);  # Alois P. Heinz, Apr 04 2016

CROSSREFS

Cf. A000110 (row lengths), A120698, A120696 (sorted), A120697, A071155.

Column k=0 gives A007489.

Sequence in context: A061556 A053993 A071155 * A103578 A116649 A129771

Adjacent sequences:  A120692 A120693 A120694 * A120696 A120697 A120698

KEYWORD

base,nonn,look,tabf

AUTHOR

Franklin T. Adams-Watters, Jun 28 2006

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 December 10 21:23 EST 2016. Contains 279011 sequences.