A281939 - cp's OEIS frontend

A281939 Number of ways to write n as x^2 + y^2 + z^2 + w^2 with x - y and 3*z + w both squares, where x,y,z are nonnegative integers and w is an integer.

n	a(n)
0	1
1	2
2	3
3	2
4	1
5	2
6	2
7	2
8	2
9	3
10	5
11	2
12	1
13	4
14	3
15	3
16	3
17	3
18	6
19	1
20	1
21	4
22	1
23	2
24	2
25	3
26	7
27	5
28	3
29	3
30	3
31	4
32	3
33	4
34	8
35	3
36	2
37	4
38	3
39	4
40	5
41	7
42	10
43	2
44	1
45	7
46	1
47	2
48	5
49	2
50	7
51	4
52	3
53	4
54	2
55	3
56	3
57	3
58	7
59	4
60	4
61	3
62	3
63	6
64	1
65	5
66	12
67	4
68	1
69	4
70	4
71	3
72	4
73	5
74	8
75	4
76	3
77	4
78	4
79	3
80	5

[1, 2, 3, 2, 1, 2, 2, 2, 2, 3, 5, 2, 1, 4, 3, 3, 3, 3, 6, 1, 1, 4, 1, 2, 2, 3, 7, 5, 3, 3, 3, 4, 3, 4, 8, 3, 2, 4, 3, 4, 5, 7, 10, 2, 1, 7, 1, 2, 5, 2, 7, 4, 3, 4, 2, 3, 3, 3, 7, 4, 4, 3, 3, 6, 1, 5, 12, 4, 1, 4, 4, 3, 4, 5, 8, 4, 3, 4, 4, 3, 5]

cp's OEIS Frontend

A281939 Number of ways to write n as x^2 + y^2 + z^2 + w^2 with x - y and 3*z + w both squares, where x,y,z are nonnegative integers and w is an integer.

Table of values

List of values

n	a(n)
0	1
1	2
2	3
3	2
4	1
5	2
6	2
7	2
8	2
9	3
10	5
11	2
12	1
13	4
14	3
15	3
16	3
17	3
18	6
19	1
20	1
21	4
22	1
23	2
24	2
25	3
26	7
27	5
28	3
29	3
30	3
31	4
32	3
33	4
34	8
35	3
36	2
37	4
38	3
39	4
40	5
41	7
42	10
43	2
44	1
45	7
46	1
47	2
48	5
49	2
50	7
51	4
52	3
53	4
54	2
55	3
56	3
57	3
58	7
59	4
60	4
61	3
62	3
63	6
64	1
65	5
66	12
67	4
68	1
69	4
70	4
71	3
72	4
73	5
74	8
75	4
76	3
77	4
78	4
79	3
80	5

n	a(n)
0	1
1	2
2	3
3	2
4	1
5	2
6	2
7	2
8	2
9	3
10	5
11	2
12	1
13	4
14	3
15	3
16	3
17	3
18	6
19	1
20	1
21	4
22	1
23	2
24	2
25	3
26	7
27	5
28	3
29	3
30	3
31	4
32	3
33	4
34	8
35	3
36	2
37	4
38	3
39	4
40	5
41	7
42	10
43	2
44	1
45	7
46	1
47	2
48	5
49	2
50	7
51	4
52	3
53	4
54	2
55	3
56	3
57	3
58	7
59	4
60	4
61	3
62	3
63	6
64	1
65	5
66	12
67	4
68	1
69	4
70	4
71	3
72	4
73	5
74	8
75	4
76	3
77	4
78	4
79	3
80	5

n	a(n)
0	1
1	2
2	3
3	2
4	1
5	2
6	2
7	2
8	2
9	3
10	5
11	2
12	1
13	4
14	3
15	3
16	3
17	3
18	6
19	1
20	1
21	4
22	1
23	2
24	2
25	3
26	7
27	5
28	3
29	3
30	3
31	4
32	3
33	4
34	8
35	3
36	2
37	4
38	3
39	4
40	5
41	7
42	10
43	2
44	1
45	7
46	1
47	2
48	5
49	2
50	7
51	4
52	3
53	4
54	2
55	3
56	3
57	3
58	7
59	4
60	4
61	3
62	3
63	6
64	1
65	5
66	12
67	4
68	1
69	4
70	4
71	3
72	4
73	5
74	8
75	4
76	3
77	4
78	4
79	3
80	5