A259691 - cp's OEIS frontend

A259691 Triangle read by rows: T(n,k) number of arrangements of non-attacking rooks on an n X n right triangular board where the top rook is in row k (n >= 0, 1 <= k <= n+1).

n	a(n)
0	1
1	1
2	1
3	2
4	2
5	1
6	5
7	6
8	3
9	1
10	15
11	20
12	12
13	4
14	1
15	52
16	74
17	51
18	20
19	5
20	1
21	203
22	302
23	231
24	104
25	30
26	6
27	1
28	877
29	1348
30	1116
31	564
32	185
33	42
34	7
35	1
36	4140
37	6526
38	5745
39	3196
40	1175
41	300
42	56
43	8
44	1
45	21147
46	34014
47	31443
48	18944
49	7700
50	2190
51	455
52	72
53	9
54	1

[1, 1, 1, 2, 2, 1, 5, 6, 3, 1, 15, 20, 12, 4, 1, 52, 74, 51, 20, 5, 1, 203, 302, 231, 104, 30, 6, 1, 877, 1348, 1116, 564, 185, 42, 7, 1, 4140, 6526, 5745, 3196, 1175, 300, 56, 8, 1, 21147, 34014, 31443, 18944, 7700, 2190, 455, 72, 9, 1]

cp's OEIS Frontend

A259691 Triangle read by rows: T(n,k) number of arrangements of non-attacking rooks on an n X n right triangular board where the top rook is in row k (n >= 0, 1 <= k <= n+1).

Table of values

List of values