|
Search: id:A084870
|
|
|
| A084870 |
|
Number of 3-multiantichains of an n-set. |
|
+0
1
|
|
| 1, 2, 6, 28, 190, 1692, 16766, 166028, 1586430, 14580412, 129654526, 1123451628, 9544185470, 79881877532, 661135445886, 5425962250828, 44250287565310, 359161631645052, 2904756409742846, 23429320590259628, 188594431902253950
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
LINKS
|
Goran Kilibarda and Vladeta Jovovic, Antichains of Multisets, J. Integer Seqs., Vol. 7, 2004.
|
|
FORMULA
|
(1/3!)*(8^n - 6*6^n+6*5^n+9*4^n - 18*3^n+14*2^n).
|
|
CROSSREFS
|
Cf. A016269, A047707, A051112-A051118, A084869-A084883.
Sequence in context: A104018 A100526 A084262 this_sequence A111342 A008964 A058128
Adjacent sequences: A084867 A084868 A084869 this_sequence A084871 A084872 A084873
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Goran Kilibarda, Vladeta Jovovic (vladeta(AT)eunet.rs), Jun 10 2003
|
|
|
Search completed in 0.002 seconds
|
