A133628 - cp's OEIS frontend

A133628 a(1)=1, a(n) = a(n-1) + (p-1)*p^(n/2-1) if n is even, else a(n) = a(n-1) + p^((n-1)/2), where p=4.

n	a(n)
1	1
2	4
3	8
4	20
5	36
6	84
7	148
8	340
9	596
10	1364
11	2388
12	5460
13	9556
14	21844
15	38228
16	87380
17	152916
18	349524
19	611668
20	1398100
21	2446676
22	5592404
23	9786708
24	22369620
25	39146836
26	89478484
27	156587348
28	357913940
29	626349396
30	1431655764
31	2505397588

[1, 4, 8, 20, 36, 84, 148, 340, 596, 1364, 2388, 5460, 9556, 21844, 38228, 87380, 152916, 349524, 611668, 1398100, 2446676, 5592404, 9786708, 22369620, 39146836, 89478484, 156587348, 357913940, 626349396, 1431655764, 2505397588]

cp's OEIS Frontend

A133628 a(1)=1, a(n) = a(n-1) + (p-1)*p^(n/2-1) if n is even, else a(n) = a(n-1) + p^((n-1)/2), where p=4.

Table of values

List of values