A255260 - cp's OEIS frontend

A255260 a(n) = a(n-1) + sum of the pentagonal numbers which are among the first (n-1) terms of the sequence, with a(1)=1.

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	11
7	17
8	23
9	29
10	35
11	76
12	117
13	275
14	433
15	591
16	749
17	907
18	1065
19	1223
20	1381
21	1539
22	1697
23	1855
24	2013
25	2171
26	2329
27	2487
28	2645
29	2803
30	2961
31	3119
32	3277
33	3435
34	3593
35	3751
36	3909
37	4067
38	4225
39	4383
40	4541
41	4699
42	4857
43	5015
44	5173
45	5331
46	5489
47	5647
48	5805

[1, 2, 3, 4, 5, 11, 17, 23, 29, 35, 76, 117, 275, 433, 591, 749, 907, 1065, 1223, 1381, 1539, 1697, 1855, 2013, 2171, 2329, 2487, 2645, 2803, 2961, 3119, 3277, 3435, 3593, 3751, 3909, 4067, 4225, 4383, 4541, 4699, 4857, 5015, 5173, 5331, 5489, 5647, 5805]

cp's OEIS Frontend

A255260 a(n) = a(n-1) + sum of the pentagonal numbers which are among the first (n-1) terms of the sequence, with a(1)=1.

Table of values

List of values