A133629 - cp's OEIS frontend

A133629 a(1)=1, a(n) = a(n-1) + (p-1)*p^(n/2-1) if n is even, otherwise a(n) = a(n-1) + p^((n-1)/2), where p=5.

n	a(n)
1	1
2	5
3	10
4	30
5	55
6	155
7	280
8	780
9	1405
10	3905
11	7030
12	19530
13	35155
14	97655
15	175780
16	488280
17	878905
18	2441405
19	4394530
20	12207030
21	21972655
22	61035155
23	109863280
24	305175780
25	549316405
26	1525878905
27	2746582030
28	7629394530
29	13732910155
30	38146972655
31	68664550780

[1, 5, 10, 30, 55, 155, 280, 780, 1405, 3905, 7030, 19530, 35155, 97655, 175780, 488280, 878905, 2441405, 4394530, 12207030, 21972655, 61035155, 109863280, 305175780, 549316405, 1525878905, 2746582030, 7629394530, 13732910155, 38146972655, 68664550780]

cp's OEIS Frontend

A133629 a(1)=1, a(n) = a(n-1) + (p-1)*p^(n/2-1) if n is even, otherwise a(n) = a(n-1) + p^((n-1)/2), where p=5.

Table of values

List of values