A143975 - cp's OEIS frontend

A143975 a(n) = floor(n*(n+3)/3).

n	a(n)
1	1
2	3
3	6
4	9
5	13
6	18
7	23
8	29
9	36
10	43
11	51
12	60
13	69
14	79
15	90
16	101
17	113
18	126
19	139
20	153
21	168
22	183
23	199
24	216
25	233
26	251
27	270
28	289
29	309
30	330
31	351
32	373
33	396
34	419
35	443
36	468
37	493
38	519
39	546
40	573
41	601
42	630
43	659
44	689
45	720
46	751
47	783
48	816
49	849
50	883
51	918
52	953
53	989
54	1026
55	1063
56	1101

[1, 3, 6, 9, 13, 18, 23, 29, 36, 43, 51, 60, 69, 79, 90, 101, 113, 126, 139, 153, 168, 183, 199, 216, 233, 251, 270, 289, 309, 330, 351, 373, 396, 419, 443, 468, 493, 519, 546, 573, 601, 630, 659, 689, 720, 751, 783, 816, 849, 883, 918, 953, 989, 1026, 1063, 1101]

cp's OEIS Frontend

A143975 a(n) = floor(n*(n+3)/3).

Table of values

List of values