A203246 - cp's OEIS frontend

A203246 Second elementary symmetric function of the first n terms of (1,1,2,2,3,3,4,4,...).

n	a(n)
2	1
3	5
4	13
5	31
6	58
7	106
8	170
9	270
10	395
11	575
12	791
13	1085
14	1428
15	1876
16	2388
17	3036
18	3765
19	4665
20	5665
21	6875
22	8206
23	9790
24	11518
25	13546
26	15743
27	18291
28	21035
29	24185
30	27560
31	31400
32	35496
33	40120
34	45033
35	50541
36	56373
37	62871
38	69730
39	77330
40	85330
41	94150
42	103411
43	113575

[1, 5, 13, 31, 58, 106, 170, 270, 395, 575, 791, 1085, 1428, 1876, 2388, 3036, 3765, 4665, 5665, 6875, 8206, 9790, 11518, 13546, 15743, 18291, 21035, 24185, 27560, 31400, 35496, 40120, 45033, 50541, 56373, 62871, 69730, 77330, 85330, 94150, 103411, 113575]

cp's OEIS Frontend

A203246 Second elementary symmetric function of the first n terms of (1,1,2,2,3,3,4,4,...).

Table of values

List of values