A330619 - cp's OEIS frontend

A330619 Array read by rows: T(n,k) is the number of solutions to the equation Sum_{i=1..n} x_i^2 == k (mod 4) with x_i in 0..3, where n >= 0 and 0 <= k <= 3.

n	a(n)
0	1
1	0
2	0
3	0
4	2
5	2
6	0
7	0
8	4
9	8
10	4
11	0
12	8
13	24
14	24
15	8
16	32
17	64
18	96
19	64
20	192
21	192
22	320
23	320
24	1024
25	768
26	1024
27	1280
28	4608
29	3584
30	3584
31	4608
32	18432
33	16384
34	14336
35	16384
36	69632
37	69632
38	61440
39	61440
40	262144
41	278528
42	262144
43	245760
44	1015808
45	1081344
46	1081344
47	1015808
48	4063232
49	4194304
50	4325376
51	4194304

[1, 0, 0, 0, 2, 2, 0, 0, 4, 8, 4, 0, 8, 24, 24, 8, 32, 64, 96, 64, 192, 192, 320, 320, 1024, 768, 1024, 1280, 4608, 3584, 3584, 4608, 18432, 16384, 14336, 16384, 69632, 69632, 61440, 61440, 262144, 278528, 262144, 245760, 1015808, 1081344, 1081344, 1015808, 4063232, 4194304, 4325376, 4194304]

cp's OEIS Frontend

A330619 Array read by rows: T(n,k) is the number of solutions to the equation Sum_{i=1..n} x_i^2 == k (mod 4) with x_i in 0..3, where n >= 0 and 0 <= k <= 3.

Table of values

List of values