A131118 - cp's OEIS frontend

A131118 a(4n) = -n^2, a(4n+1) = n^2, a(4n+2) = 1-n^2, a(4n+3) = n*(n+1).

n	a(n)
0	0
1	0
2	1
3	0
4	-1
5	1
6	0
7	2
8	-4
9	4
10	-3
11	6
12	-9
13	9
14	-8
15	12
16	-16
17	16
18	-15
19	20
20	-25
21	25
22	-24
23	30
24	-36
25	36
26	-35
27	42
28	-49
29	49
30	-48
31	56
32	-64
33	64
34	-63
35	72
36	-81
37	81
38	-80
39	90
40	-100
41	100
42	-99
43	110
44	-121
45	121
46	-120
47	132
48	-144
49	144
50	-143
51	156
52	-169
53	169
54	-168

[0, 0, 1, 0, -1, 1, 0, 2, -4, 4, -3, 6, -9, 9, -8, 12, -16, 16, -15, 20, -25, 25, -24, 30, -36, 36, -35, 42, -49, 49, -48, 56, -64, 64, -63, 72, -81, 81, -80, 90, -100, 100, -99, 110, -121, 121, -120, 132, -144, 144, -143, 156, -169, 169, -168]

cp's OEIS Frontend

A131118 a(4n) = -n^2, a(4n+1) = n^2, a(4n+2) = 1-n^2, a(4n+3) = n*(n+1).

Table of values

List of values