|
Search: id:A136564
|
|
|
| A136564 |
|
Array read by rows: T(n,k) is the number of directed multigraphs with loops with n arcs, k vertices and no vertex of degree 0. |
|
+0
7
|
|
| 1, 1, 1, 5, 4, 1, 1, 9, 21, 16, 4, 1, 1, 18, 71, 108, 71, 22, 4, 1, 1, 27, 194, 491, 557, 326, 101, 22, 4, 1, 1, 43, 476, 1903, 3353, 3062, 1587, 497, 111, 22, 4, 1, 1, 59, 1030, 6298, 16644, 22352, 17035, 7982, 2433, 555, 111, 22, 4, 1, 1, 84, 2095, 18823, 72064
(list; table; graph; listen)
|
|
|
OFFSET
|
1,4
|
|
|
COMMENT
|
Length of the n^th row: 2n.
T(n,1)=T(n,2n)=1 and T(n,2n-1)=4 if n>1.
Row sums: A052171.
Sums of the first 2 entries of each row: A005993.
Sums of the first 3 entries of each row: A050927.
Sums of the first 4 entries of each row: A050929.
|
|
CROSSREFS
|
Adjacent sequences: A136561 A136562 A136563 this_sequence A136565 A136566 A136567
Sequence in context: A124602 A132707 A046575 this_sequence A136042 A087707 A113011
|
|
KEYWORD
|
nonn,tabl,new
|
|
AUTHOR
|
Benoit Jubin (benoit_jubin(AT)yahoo.fr), Apr 14 2008
|
|
EXTENSIONS
|
More terms from Benoit Jubin and Vladeta Jovovic (vladeta(AT)eunet.yu), Sep 08 2008
|
|
|
Search completed in 0.002 seconds
|
