A099958 - cp's OEIS frontend

A099958 (1/2)*number of distinct angular positions under which an observer positioned at the center of an edge of a square lattice can see the (2n)X(2n-1) points symmetrically surrounding his position.

n	a(n)
1	1
2	5
3	13
4	23
5	37
6	55
7	75
8	95
9	127
10	157
11	185
12	227
13	263
14	305
15	357
16	403
17	455
18	511
19	571
20	631
21	703
22	769
23	833
24	923
25	997
26	1069
27	1169
28	1245
29	1329
30	1443
31	1535
32	1631
33	1743
34	1849
35	1957
36	2075
37	2195
38	2307
39	2439
40	2565
41	2683
42	2845
43	2957
44	3097
45	3265
46	3385

[1, 5, 13, 23, 37, 55, 75, 95, 127, 157, 185, 227, 263, 305, 357, 403, 455, 511, 571, 631, 703, 769, 833, 923, 997, 1069, 1169, 1245, 1329, 1443, 1535, 1631, 1743, 1849, 1957, 2075, 2195, 2307, 2439, 2565, 2683, 2845, 2957, 3097, 3265, 3385]

cp's OEIS Frontend

A099958 (1/2)*number of distinct angular positions under which an observer positioned at the center of an edge of a square lattice can see the (2n)X(2n-1) points symmetrically surrounding his position.

Table of values

List of values