A377501 - cp's OEIS frontend

A377501 a(n) = 2 + 4^(n - 1) - (2 - sqrt(2))^(n - 1) - (2 + sqrt(2))^(n - 1).

n	a(n)
1	1
2	2
3	6
4	26
5	122
6	562
7	2514
8	10978
9	47074
10	199106
11	833346
12	3459458
13	14268290
14	58542850
15	239189250
16	973889026
17	3954048514
18	16015899650
19	64745436162
20	261309683714
21	1053186816002
22	4239883710466
23	17052184465410
24	68525063462914
25	275180257009666
26	1104408389468162

[1, 2, 6, 26, 122, 562, 2514, 10978, 47074, 199106, 833346, 3459458, 14268290, 58542850, 239189250, 973889026, 3954048514, 16015899650, 64745436162, 261309683714, 1053186816002, 4239883710466, 17052184465410, 68525063462914, 275180257009666, 1104408389468162]

cp's OEIS Frontend

A377501 a(n) = 2 + 4^(n - 1) - (2 - sqrt(2))^(n - 1) - (2 + sqrt(2))^(n - 1).

Table of values

List of values