A257493 - cp's OEIS frontend

A257493 Number A(n,k) of n X n nonnegative integer matrices with all row and column sums equal to k; square array A(n,k), n >= 0, k >= 0, read by antidiagonals.

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	2
9	1
10	1
11	1
12	3
13	6
14	1
15	1
16	1
17	4
18	21
19	24
20	1
21	1
22	1
23	5
24	55
25	282
26	120
27	1
28	1
29	1
30	6
31	120
32	2008
33	6210
34	720
35	1
36	1
37	1
38	7
39	231
40	10147
41	153040
42	202410
43	5040
44	1
45	1
46	1
47	8
48	406
49	40176
50	2224955
51	20933840
52	9135630
53	40320
54	1
55	1
56	1
57	9
58	666
59	132724
60	22069251
61	1047649905
62	4662857360
63	545007960
64	362880
65	1

[1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 3, 6, 1, 1, 1, 4, 21, 24, 1, 1, 1, 5, 55, 282, 120, 1, 1, 1, 6, 120, 2008, 6210, 720, 1, 1, 1, 7, 231, 10147, 153040, 202410, 5040, 1, 1, 1, 8, 406, 40176, 2224955, 20933840, 9135630, 40320, 1, 1, 1, 9, 666, 132724, 22069251, 1047649905, 4662857360, 545007960, 362880, 1]

cp's OEIS Frontend

A257493 Number A(n,k) of n X n nonnegative integer matrices with all row and column sums equal to k; square array A(n,k), n >= 0, k >= 0, read by antidiagonals.

Table of values

List of values