A338426 - cp's OEIS frontend

A338426 a(n) is the number of paths a chess king can take from (0,0) to (n+1,0) touching each point in {-1,0,1} X {1,2,...,n} exactly once.

n	a(n)
0	1
1	2
2	28
3	154
4	1206
5	8364
6	60614
7	432636
8	3104484
9	22235310
10	159360540
11	1141875800
12	8182608226
13	58634396372
14	420162632840
15	3010793013534
16	21574706493988
17	154599722419136
18	1107828637412194
19	7938463325113516
20	56885333141857872
21	407628148378295190

[1, 2, 28, 154, 1206, 8364, 60614, 432636, 3104484, 22235310, 159360540, 1141875800, 8182608226, 58634396372, 420162632840, 3010793013534, 21574706493988, 154599722419136, 1107828637412194, 7938463325113516, 56885333141857872, 407628148378295190]

cp's OEIS Frontend

A338426 a(n) is the number of paths a chess king can take from (0,0) to (n+1,0) touching each point in {-1,0,1} X {1,2,...,n} exactly once.

Table of values

List of values