|
Search: id:A052281
|
|
|
| A052281 |
|
Number of 4 X 4 symmetric stochastic matrices under row and column permutations. |
|
+0
4
|
|
| 1, 1, 3, 6, 16, 29, 62, 107, 195, 320, 522, 804, 1234, 1804, 2626, 3700, 5155, 7038
(list; graph; listen)
|
|
|
OFFSET
|
0,3
|
|
|
EXAMPLE
|
There are 6 nonisomorphic symmetric 4 X 4 matrices with row and column sums 3:
[0 0 0 3] [0 0 1 2] [0 0 1 2] [0 0 1 2] [0 0 1 2] [0 1 1 1]
[0 0 3 0] [0 0 2 1] [0 1 1 1] [0 1 2 0] [0 2 1 0] [1 0 1 1]
[0 3 0 0] [1 2 0 0] [1 1 1 0] [1 2 0 0] [1 1 0 1] [1 1 0 1]
[3 0 0 0] [2 1 0 0] [2 1 0 0] [2 0 0 1] [2 0 1 0] [1 1 1 0]
|
|
CROSSREFS
|
Cf. A053493, A001496, A052280, A052282.
Sequence in context: A130596 A151954 A032247 this_sequence A122742 A052370 A053304
Adjacent sequences: A052278 A052279 A052280 this_sequence A052282 A052283 A052284
|
|
KEYWORD
|
more,nonn
|
|
AUTHOR
|
Vladeta Jovovic (vladeta(AT)eunet.rs), Feb 06 2000
|
|
|
Search completed in 0.002 seconds
|
