A110344 - cp's OEIS frontend

A110344 a(n) = Sum_{k=0..n-1} (n+k) = n(3n-1)/2 if n is even; a(n) = Sum_{k=0..n-1} (n-k) = n(n+1)/2 if n is odd.

n	a(n)
1	1
2	5
3	6
4	22
5	15
6	51
7	28
8	92
9	45
10	145
11	66
12	210
13	91
14	287
15	120
16	376
17	153
18	477
19	190
20	590
21	231
22	715
23	276
24	852
25	325
26	1001
27	378
28	1162
29	435
30	1335
31	496
32	1520
33	561
34	1717
35	630
36	1926
37	703
38	2147
39	780
40	2380
41	861
42	2625
43	946
44	2882
45	1035
46	3151
47	1128
48	3432
49	1225
50	3725
51	1326

[1, 5, 6, 22, 15, 51, 28, 92, 45, 145, 66, 210, 91, 287, 120, 376, 153, 477, 190, 590, 231, 715, 276, 852, 325, 1001, 378, 1162, 435, 1335, 496, 1520, 561, 1717, 630, 1926, 703, 2147, 780, 2380, 861, 2625, 946, 2882, 1035, 3151, 1128, 3432, 1225, 3725, 1326]

cp's OEIS Frontend

A110344 a(n) = Sum_{k=0..n-1} (n+k) = n(3n-1)/2 if n is even; a(n) = Sum_{k=0..n-1} (n-k) = n(n+1)/2 if n is odd.

Table of values

List of values