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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A182728 Array T(n,k) = n*k*A000041(n) read by antidiagonals, n,k >= 1. 4
1, 4, 2, 9, 8, 3, 20, 18, 12, 4, 35, 40, 27, 16, 5, 66, 70, 60, 36, 20, 6, 105, 132, 105, 80, 45, 24, 7, 176, 210, 198, 140, 100, 54, 28, 8, 270, 352, 315, 264, 175, 120, 63, 32, 9, 420, 540, 528, 420, 330, 210, 140, 72, 36, 10, 616, 840, 810, 704, 525, 396, 245, 160, 81, 40, 11 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..66.

EXAMPLE

Array begins:

    1,   2,   3,   4,   5,   6,   7, ...

    4,   8,  12,  16,  20,  24,  28, ...

    9,  18,  27,  36,  45,  54,  63, ...

   20,  40,  60,  80, 100, 120, 140, ...

   35,  70, 105, 140, 175, 210, 245, ...

   66, 132, 198, 264, 330, 396, 462, ...

  105, 210, 315, 420, 525, 630, 735, ...

MAPLE

A182728 := proc(n, k) n*k*combinat[numbpart](n) ; end proc:

seq(seq( A182728(d+1-k, k), k=1..d), d=1..10) ; # R. J. Mathar, Feb 01 2011

CROSSREFS

Cf. A000041, A135010, A182729, A183011.

Column 1 gives A066186. Column 24 gives A183009.

Sequence in context: A104583 A278103 A249327 * A290538 A097664 A144811

Adjacent sequences:  A182725 A182726 A182727 * A182729 A182730 A182731

KEYWORD

nonn,easy,tabl

AUTHOR

Omar E. Pol, Jan 22 2011

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
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 15 22:19 EDT 2019. Contains 324145 sequences. (Running on oeis4.)