A023855 - cp's OEIS frontend

A023855 a(n) = 1(n) + 2(n-1) + 3(n-2) + ... + (n+1-k)k, where k = floor((n+1)/2).

n	a(n)
1	1
2	2
3	7
4	10
5	22
6	28
7	50
8	60
9	95
10	110
11	161
12	182
13	252
14	280
15	372
16	408
17	525
18	570
19	715
20	770
21	946
22	1012
23	1222
24	1300
25	1547
26	1638
27	1925
28	2030
29	2360
30	2480
31	2856
32	2992
33	3417
34	3570
35	4047
36	4218
37	4750
38	4940
39	5530
40	5740
41	6391
42	6622
43	7337
44	7590
45	8372
46	8648
47	9500
48	9800
49	10725
50	11050

[1, 2, 7, 10, 22, 28, 50, 60, 95, 110, 161, 182, 252, 280, 372, 408, 525, 570, 715, 770, 946, 1012, 1222, 1300, 1547, 1638, 1925, 2030, 2360, 2480, 2856, 2992, 3417, 3570, 4047, 4218, 4750, 4940, 5530, 5740, 6391, 6622, 7337, 7590, 8372, 8648, 9500, 9800, 10725, 11050]

cp's OEIS Frontend

A023855 a(n) = 1(n) + 2(n-1) + 3(n-2) + ... + (n+1-k)k, where k = floor((n+1)/2).

Table of values

List of values

cp's OEIS Frontend

A023855 a(n) = 1*(n) + 2*(n-1) + 3*(n-2) + ... + (n+1-k)*k, where k = floor((n+1)/2).

Table of values

List of values

A023855 a(n) = 1(n) + 2(n-1) + 3(n-2) + ... + (n+1-k)k, where k = floor((n+1)/2).