A023857 - cp's OEIS frontend

A023857 a(n) = 1(n+3-1) + 2(n+3-2) + .... + k*(n+3-k), where k=floor((n+1)/2).

n	a(n)
1	3
2	4
3	13
4	16
5	34
6	40
7	70
8	80
9	125
10	140
11	203
12	224
13	308
14	336
15	444
16	480
17	615
18	660
19	825
20	880
21	1078
22	1144
23	1378
24	1456
25	1729
26	1820
27	2135
28	2240
29	2600
30	2720
31	3128
32	3264
33	3723
34	3876
35	4389
36	4560
37	5130
38	5320
39	5950
40	6160
41	6853
42	7084
43	7843
44	8096
45	8924
46	9200
47	10100
48	10400
49	11375
50	11700

[3, 4, 13, 16, 34, 40, 70, 80, 125, 140, 203, 224, 308, 336, 444, 480, 615, 660, 825, 880, 1078, 1144, 1378, 1456, 1729, 1820, 2135, 2240, 2600, 2720, 3128, 3264, 3723, 3876, 4389, 4560, 5130, 5320, 5950, 6160, 6853, 7084, 7843, 8096, 8924, 9200, 10100, 10400, 11375, 11700]

cp's OEIS Frontend

A023857 a(n) = 1(n+3-1) + 2(n+3-2) + .... + k*(n+3-k), where k=floor((n+1)/2).

Table of values

List of values

cp's OEIS Frontend

A023857 a(n) = 1*(n+3-1) + 2*(n+3-2) + .... + k*(n+3-k), where k=floor((n+1)/2).

Table of values

List of values

A023857 a(n) = 1(n+3-1) + 2(n+3-2) + .... + k*(n+3-k), where k=floor((n+1)/2).