A110345 - cp's OEIS frontend

A110345 a(n) = n + (n+1) + (n+2) + ... n terms if n is odd, else a(n) = n + (n-1) + (n-2) + ... n terms = n(n+1)/2 = n-th triangular number if n is even.

n	a(n)
1	1
2	3
3	12
4	10
5	35
6	21
7	70
8	36
9	117
10	55
11	176
12	78
13	247
14	105
15	330
16	136
17	425
18	171
19	532
20	210
21	651
22	253
23	782
24	300
25	925
26	351
27	1080
28	406
29	1247
30	465
31	1426
32	528
33	1617
34	595
35	1820
36	666
37	2035
38	741
39	2262
40	820
41	2501
42	903
43	2752
44	990
45	3015
46	1081
47	3290
48	1176
49	3577
50	1275
51	3876
52	1378

[1, 3, 12, 10, 35, 21, 70, 36, 117, 55, 176, 78, 247, 105, 330, 136, 425, 171, 532, 210, 651, 253, 782, 300, 925, 351, 1080, 406, 1247, 465, 1426, 528, 1617, 595, 1820, 666, 2035, 741, 2262, 820, 2501, 903, 2752, 990, 3015, 1081, 3290, 1176, 3577, 1275, 3876, 1378]

cp's OEIS Frontend

A110345 a(n) = n + (n+1) + (n+2) + ... n terms if n is odd, else a(n) = n + (n-1) + (n-2) + ... n terms = n(n+1)/2 = n-th triangular number if n is even.

Table of values

List of values