A331943 - cp's OEIS frontend

A331943 a(n) = n^2 + 1 - ceiling((n + 2)/3).

n	a(n)
1	1
2	3
3	8
4	15
5	23
6	34
7	47
8	61
9	78
10	97
11	117
12	140
13	165
14	191
15	220
16	251
17	283
18	318
19	355
20	393
21	434
22	477
23	521
24	568
25	617
26	667
27	720
28	775
29	831
30	890
31	951
32	1013
33	1078
34	1145
35	1213
36	1284
37	1357
38	1431
39	1508
40	1587
41	1667
42	1750
43	1835
44	1921
45	2010
46	2101
47	2193
48	2288
49	2385
50	2483
51	2584

[1, 3, 8, 15, 23, 34, 47, 61, 78, 97, 117, 140, 165, 191, 220, 251, 283, 318, 355, 393, 434, 477, 521, 568, 617, 667, 720, 775, 831, 890, 951, 1013, 1078, 1145, 1213, 1284, 1357, 1431, 1508, 1587, 1667, 1750, 1835, 1921, 2010, 2101, 2193, 2288, 2385, 2483, 2584]

cp's OEIS Frontend

A331943 a(n) = n^2 + 1 - ceiling((n + 2)/3).

Table of values

List of values