A224213 - cp's OEIS frontend

A224213 Number of nonnegative solutions to x^2 + y^2 + z^2 + u^2 <= n.

n	a(n)
0	1
1	5
2	11
3	15
4	20
5	32
6	44
7	48
8	54
9	70
10	88
11	100
12	108
13	124
14	148
15	160
16	165
17	189
18	219
19	235
20	253
21	281
22	305
23	317
24	329
25	357
26	399
27	427
28	439
29	475
30	523
31	539
32	545
33	581
34	623
35	659
36	688
37	716
38	764
39	792
40	810
41	858
42	918
43	946
44	970
45	1030
46	1078
47	1102
48	1110
49	1154
50	1226
51	1274
52	1304
53	1352

[1, 5, 11, 15, 20, 32, 44, 48, 54, 70, 88, 100, 108, 124, 148, 160, 165, 189, 219, 235, 253, 281, 305, 317, 329, 357, 399, 427, 439, 475, 523, 539, 545, 581, 623, 659, 688, 716, 764, 792, 810, 858, 918, 946, 970, 1030, 1078, 1102, 1110, 1154, 1226, 1274, 1304, 1352]

cp's OEIS Frontend

A224213 Number of nonnegative solutions to x^2 + y^2 + z^2 + u^2 <= n.

Table of values

List of values