A083527 - cp's OEIS frontend

A083527 a(n) is the number of times that sums 1+-4+-9+-16+-...+-n^2 of the first n squares is zero. There are 2^(n-1) choices for the sign patterns.

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	1
8	1
9	0
10	0
11	1
12	5
13	0
14	0
15	43
16	57
17	0
18	0
19	239
20	430
21	0
22	0
23	2904
24	5419
25	0
26	0
27	27813
28	50213
29	0
30	0
31	348082
32	649300
33	0
34	0
35	3913496
36	7287183
37	0
38	0
39	50030553
40	93696497
41	0
42	0
43	611793542
44	1161079907
45	0
46	0
47	8009933135
48	15176652567
49	0
50	0

[0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 5, 0, 0, 43, 57, 0, 0, 239, 430, 0, 0, 2904, 5419, 0, 0, 27813, 50213, 0, 0, 348082, 649300, 0, 0, 3913496, 7287183, 0, 0, 50030553, 93696497, 0, 0, 611793542, 1161079907, 0, 0, 8009933135, 15176652567, 0, 0]

cp's OEIS Frontend

A083527 a(n) is the number of times that sums 1+-4+-9+-16+-...+-n^2 of the first n squares is zero. There are 2^(n-1) choices for the sign patterns.

Table of values

List of values