A321734 - cp's OEIS frontend

A321734 Number of nonnegative integer square matrices with sum of entries equal to n, no zero rows or columns, weakly decreasing row and column sums, and the same row sums as column sums.

n	a(n)
0	1
1	1
2	3
3	9
4	37
5	177
6	1054
7	7237
8	57447
9	512664
10	5101453
11	55870885
12	668438484
13	8667987140
14	121123281293
15	1814038728900
16	28988885491655
17	492308367375189
18	8854101716492463
19	168108959387012804
20	3360171602215686668
21	70527588239926854144
22	1550926052235372201700

[1, 1, 3, 9, 37, 177, 1054, 7237, 57447, 512664, 5101453, 55870885, 668438484, 8667987140, 121123281293, 1814038728900, 28988885491655, 492308367375189, 8854101716492463, 168108959387012804, 3360171602215686668, 70527588239926854144, 1550926052235372201700]

cp's OEIS Frontend

A321734 Number of nonnegative integer square matrices with sum of entries equal to n, no zero rows or columns, weakly decreasing row and column sums, and the same row sums as column sums.

Table of values

List of values