A084263 - cp's OEIS frontend

A084263 a(n) = (-1)^n/2+(n^2+n+1)/2.

n	a(n)
0	1
1	1
2	4
3	6
4	11
5	15
6	22
7	28
8	37
9	45
10	56
11	66
12	79
13	91
14	106
15	120
16	137
17	153
18	172
19	190
20	211
21	231
22	254
23	276
24	301
25	325
26	352
27	378
28	407
29	435
30	466
31	496
32	529
33	561
34	596
35	630
36	667
37	703
38	742
39	780
40	821
41	861
42	904
43	946
44	991
45	1035
46	1082
47	1128
48	1177
49	1225
50	1276
51	1326
52	1379
53	1431

[1, 1, 4, 6, 11, 15, 22, 28, 37, 45, 56, 66, 79, 91, 106, 120, 137, 153, 172, 190, 211, 231, 254, 276, 301, 325, 352, 378, 407, 435, 466, 496, 529, 561, 596, 630, 667, 703, 742, 780, 821, 861, 904, 946, 991, 1035, 1082, 1128, 1177, 1225, 1276, 1326, 1379, 1431]

cp's OEIS Frontend

A084263 a(n) = (-1)^n/2+(n^2+n+1)/2.

Table of values

List of values