A326611 - cp's OEIS frontend

A326611 Number of arrangements of rooks with rotational symmetry on a triangular grid with n grid points on each side and no two rooks on the same row, column or diagonal.

n	a(n)
1	2
2	1
3	1
4	4
5	3
6	5
7	10
8	9
9	15
10	40
11	41
12	65
13	162
14	189
15	321
16	780
17	919
18	1681
19	4034
20	5281
21	9259
22	23936
23	30665
24	57601
25	143602
26	199577
27	367561
28	959236
29	1323243
30	2585133
31	6580650
32	9609145
33	18433799
34	49030248
35	71211721
36	142636377
37	371147842
38	566921925
39	1122881889
40	3024341084
41	4583822647
42	9446124313

[2, 1, 1, 4, 3, 5, 10, 9, 15, 40, 41, 65, 162, 189, 321, 780, 919, 1681, 4034, 5281, 9259, 23936, 30665, 57601, 143602, 199577, 367561, 959236, 1323243, 2585133, 6580650, 9609145, 18433799, 49030248, 71211721, 142636377, 371147842, 566921925, 1122881889, 3024341084, 4583822647, 9446124313]

cp's OEIS Frontend

A326611 Number of arrangements of rooks with rotational symmetry on a triangular grid with n grid points on each side and no two rooks on the same row, column or diagonal.

Table of values

List of values