A303644 - cp's OEIS frontend

A303644 a(n) is the number of lattice points in a Cartesian grid between a square of side length 2*n, centered at the origin, and its inscribed circle. The sides of the square are parallel to the coordinate axes.

n	a(n)
1	0
2	0
3	0
4	4
5	4
6	12
7	24
8	32
9	40
10	48
11	68
12	92
13	100
14	120
15	136
16	168
17	192
18	220
19	244
20	268
21	312
22	336
23	376
24	420
25	444
26	484
27	524
28	576
29	624
30	664
31	724
32	764
33	820
34	868
35	912
36	992
37	1040
38	1116
39	1156
40	1220
41	1304
42	1368
43	1440
44	1496
45	1564
46	1660
47	1732
48	1816
49	1888
50	1960
51	2032
52	2116
53	2220
54	2308

[0, 0, 0, 4, 4, 12, 24, 32, 40, 48, 68, 92, 100, 120, 136, 168, 192, 220, 244, 268, 312, 336, 376, 420, 444, 484, 524, 576, 624, 664, 724, 764, 820, 868, 912, 992, 1040, 1116, 1156, 1220, 1304, 1368, 1440, 1496, 1564, 1660, 1732, 1816, 1888, 1960, 2032, 2116, 2220, 2308]

cp's OEIS Frontend

A303644 a(n) is the number of lattice points in a Cartesian grid between a square of side length 2*n, centered at the origin, and its inscribed circle. The sides of the square are parallel to the coordinate axes.

Table of values

List of values