A004006 - cp's OEIS frontend

A004006 a(n) = C(n,1) + C(n,2) + C(n,3), or n*(n^2 + 5)/6.

n	a(n)
0	0
1	1
2	3
3	7
4	14
5	25
6	41
7	63
8	92
9	129
10	175
11	231
12	298
13	377
14	469
15	575
16	696
17	833
18	987
19	1159
20	1350
21	1561
22	1793
23	2047
24	2324
25	2625
26	2951
27	3303
28	3682
29	4089
30	4525
31	4991
32	5488
33	6017
34	6579
35	7175
36	7806
37	8473
38	9177
39	9919
40	10700
41	11521
42	12383
43	13287
44	14234
45	15225

[0, 1, 3, 7, 14, 25, 41, 63, 92, 129, 175, 231, 298, 377, 469, 575, 696, 833, 987, 1159, 1350, 1561, 1793, 2047, 2324, 2625, 2951, 3303, 3682, 4089, 4525, 4991, 5488, 6017, 6579, 7175, 7806, 8473, 9177, 9919, 10700, 11521, 12383, 13287, 14234, 15225]

cp's OEIS Frontend

A004006 a(n) = C(n,1) + C(n,2) + C(n,3), or n*(n^2 + 5)/6.

Table of values

List of values