A290823 - cp's OEIS frontend

A290823 Irregular triangle read by rows: T(n,k) = number of k-irredundant sets in the n X n rook graph.

n	a(n)
0	1
1	1
2	1
3	1
4	4
5	6
6	1
7	9
8	36
9	48
10	1
11	16
12	120
13	416
14	632
15	1
16	25
17	300
18	1900
19	6550
20	10930
21	400
22	1
23	36
24	630
25	6240
26	37080
27	128592
28	240192
29	39600
30	900
31	1
32	49
33	1176
34	16660
35	149695
36	858774
37	3064656
38	6354866
39	2492385
40	229320
41	1764

[1, 1, 1, 1, 4, 6, 1, 9, 36, 48, 1, 16, 120, 416, 632, 1, 25, 300, 1900, 6550, 10930, 400, 1, 36, 630, 6240, 37080, 128592, 240192, 39600, 900, 1, 49, 1176, 16660, 149695, 858774, 3064656, 6354866, 2492385, 229320, 1764]

cp's OEIS Frontend

A290823 Irregular triangle read by rows: T(n,k) = number of k-irredundant sets in the n X n rook graph.

Table of values

List of values