A270073 - cp's OEIS frontend

A270073 Number of ordered ways to write n as x^2 + y^2 + z^2 + w^2 with xy + 2z*w a square, where x,y,z are nonnegative integers and w is an integer with x <= y and z >= |w|.

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

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

cp's OEIS Frontend

A270073 Number of ordered ways to write n as x^2 + y^2 + z^2 + w^2 with xy + 2z*w a square, where x,y,z are nonnegative integers and w is an integer with x <= y and z >= |w|.

Table of values

List of values

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

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

cp's OEIS Frontend

A270073 Number of ordered ways to write n as x^2 + y^2 + z^2 + w^2 with x*y + 2*z*w a square, where x,y,z are nonnegative integers and w is an integer with x <= y and z >= |w|.

Table of values

List of values

A270073 Number of ordered ways to write n as x^2 + y^2 + z^2 + w^2 with xy + 2z*w a square, where x,y,z are nonnegative integers and w is an integer with x <= y and z >= |w|.

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