A169775 - cp's OEIS frontend

A169775 Number of open knight's tour diagrams of a 3 X n chessboard that are symmetric under 180-degree rotation and have "type B": the endpoints occur in different columns and disagree in color with the cells in the nearest corner.

n	a(n)
4	2
5	0
6	0
7	0
8	8
9	0
10	16
11	0
12	48
13	0
14	200
15	0
16	616
17	0
18	1832
19	0
20	6008
21	0
22	19304
23	0
24	62180
25	0
26	189580
27	0
28	615792
29	0
30	1895952
31	0
32	6136708
33	0
34	18699436
35	0
36	60490008
37	0
38	184450888
39	0
40	595959276
41	0
42	1811054676
43	0
44	5847417040
45	0
46	17754996288
47	0
48	57292227492

[2, 0, 0, 0, 8, 0, 16, 0, 48, 0, 200, 0, 616, 0, 1832, 0, 6008, 0, 19304, 0, 62180, 0, 189580, 0, 615792, 0, 1895952, 0, 6136708, 0, 18699436, 0, 60490008, 0, 184450888, 0, 595959276, 0, 1811054676, 0, 5847417040, 0, 17754996288, 0, 57292227492]

cp's OEIS Frontend

A169775 Number of open knight's tour diagrams of a 3 X n chessboard that are symmetric under 180-degree rotation and have "type B": the endpoints occur in different columns and disagree in color with the cells in the nearest corner.

Table of values

List of values