A053459 - cp's OEIS frontend

A053459 Open disk numbers (version 4): a(n) is the number of points (i+j/2,j*sqrt(3)/2), i,j integers (triangular grid) contained in an open disk of diameter n, centered at (1/2,0).

n	a(n)
0	0
1	0
2	4
3	8
4	14
5	22
6	30
7	42
8	60
9	74
10	92
11	108
12	130
13	148
14	178
15	206
16	230
17	262
18	288
19	324
20	364
21	400
22	442
23	480
24	522
25	562
26	614
27	662
28	712
29	764
30	812
31	868
32	922
33	988
34	1050
35	1106
36	1176
37	1234
38	1312
39	1376
40	1452
41	1528
42	1598
43	1678
44	1750
45	1838
46	1920
47	2006
48	2092
49	2172
50	2266

[0, 0, 4, 8, 14, 22, 30, 42, 60, 74, 92, 108, 130, 148, 178, 206, 230, 262, 288, 324, 364, 400, 442, 480, 522, 562, 614, 662, 712, 764, 812, 868, 922, 988, 1050, 1106, 1176, 1234, 1312, 1376, 1452, 1528, 1598, 1678, 1750, 1838, 1920, 2006, 2092, 2172, 2266]

cp's OEIS Frontend

A053459 Open disk numbers (version 4): a(n) is the number of points (i+j/2,j*sqrt(3)/2), i,j integers (triangular grid) contained in an open disk of diameter n, centered at (1/2,0).

Table of values

List of values