A308385 - cp's OEIS frontend

A308385 a(n) is the last square visited by fers moves on a spirally numbered (2n-1) X (2n-1) board, moving to the lowest available unvisited square at each step.

n	a(n)
1	1
2	3
3	15
4	29
5	61
6	87
7	139
8	177
9	249
10	299
11	391
12	453
13	565
14	639
15	771
16	857
17	1009
18	1107
19	1279
20	1389
21	1581
22	1703
23	1915
24	2049
25	2281
26	2427
27	2679
28	2837
29	3109
30	3279
31	3571
32	3753
33	4065
34	4259
35	4591
36	4797
37	5149
38	5367
39	5739
40	5969
41	6361
42	6603
43	7015
44	7269
45	7701
46	7967
47	8419

[1, 3, 15, 29, 61, 87, 139, 177, 249, 299, 391, 453, 565, 639, 771, 857, 1009, 1107, 1279, 1389, 1581, 1703, 1915, 2049, 2281, 2427, 2679, 2837, 3109, 3279, 3571, 3753, 4065, 4259, 4591, 4797, 5149, 5367, 5739, 5969, 6361, 6603, 7015, 7269, 7701, 7967, 8419]

cp's OEIS Frontend

A308385 a(n) is the last square visited by fers moves on a spirally numbered (2n-1) X (2n-1) board, moving to the lowest available unvisited square at each step.

Table of values

List of values