A273021 - cp's OEIS frontend

A273021 Number of ordered ways to write n as x^2 + y^2 + z^2 + w^2 with 2xy + yz - zw - w*x a square, where w is a positive integer and x,y,z are nonnegative integers with x <= y.

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

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

cp's OEIS Frontend

A273021 Number of ordered ways to write n as x^2 + y^2 + z^2 + w^2 with 2xy + yz - zw - w*x a square, where w is a positive integer and x,y,z are nonnegative integers with x <= y.

Table of values

List of values

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

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

cp's OEIS Frontend

A273021 Number of ordered ways to write n as x^2 + y^2 + z^2 + w^2 with 2*x*y + y*z - z*w - w*x a square, where w is a positive integer and x,y,z are nonnegative integers with x <= y.

Table of values

List of values

A273021 Number of ordered ways to write n as x^2 + y^2 + z^2 + w^2 with 2xy + yz - zw - w*x a square, where w is a positive integer and x,y,z are nonnegative integers with x <= y.

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