A169771 - cp's OEIS frontend

A169771 Number of open knight's tour diagrams of a 3 X n chessboard that have "type F": the endpoints occur in different columns and agree in color with the cells in the nearest corner.

n	a(n)
4	2
5	0
6	0
7	52
8	224
9	520
10	1616
11	10320
12	37024
13	125120
14	441200
15	1798576
16	6327472
17	22985504
18	81178008
19	301420176
20	1057619944
21	3818476576
22	13412523392
23	48285742208
24	168992600680
25	602349395456
26	2106360581920
27	7471875943776
28	26073917403304
29	92017860990176
30	320713651212384

[2, 0, 0, 52, 224, 520, 1616, 10320, 37024, 125120, 441200, 1798576, 6327472, 22985504, 81178008, 301420176, 1057619944, 3818476576, 13412523392, 48285742208, 168992600680, 602349395456, 2106360581920, 7471875943776, 26073917403304, 92017860990176, 320713651212384]

cp's OEIS Frontend

A169771 Number of open knight's tour diagrams of a 3 X n chessboard that have "type F": the endpoints occur in different columns and agree in color with the cells in the nearest corner.

Table of values

List of values