A290768 - cp's OEIS frontend

A290768 a(n) = (3/2)*(n^2 - n + 2).

n	a(n)
1	3
2	6
3	12
4	21
5	33
6	48
7	66
8	87
9	111
10	138
11	168
12	201
13	237
14	276
15	318
16	363
17	411
18	462
19	516
20	573
21	633
22	696
23	762
24	831
25	903
26	978
27	1056
28	1137
29	1221
30	1308
31	1398
32	1491
33	1587
34	1686
35	1788
36	1893
37	2001
38	2112
39	2226
40	2343
41	2463
42	2586
43	2712
44	2841
45	2973
46	3108
47	3246
48	3387
49	3531
50	3678

[3, 6, 12, 21, 33, 48, 66, 87, 111, 138, 168, 201, 237, 276, 318, 363, 411, 462, 516, 573, 633, 696, 762, 831, 903, 978, 1056, 1137, 1221, 1308, 1398, 1491, 1587, 1686, 1788, 1893, 2001, 2112, 2226, 2343, 2463, 2586, 2712, 2841, 2973, 3108, 3246, 3387, 3531, 3678]

cp's OEIS Frontend

A290768 a(n) = (3/2)*(n^2 - n + 2).

Table of values

List of values