A127978 - cp's OEIS frontend

A127978 a(n) = ((15n + 34)/54)2^(n-1) - (-1)^(n-1)(6n + 5)/27.

n	a(n)
2	3
3	5
4	15
5	31
6	75
7	163
8	367
9	799
10	1747
11	3771
12	8119
13	17367
14	37019
15	78579
16	166271
17	350735
18	737891
19	1548587
20	3242823
21	6776903
22	14136363
23	29437795
24	61205775
25	127071871
26	263464435
27	545570203
28	1128423127
29	2331411639
30	4811954107

[3, 5, 15, 31, 75, 163, 367, 799, 1747, 3771, 8119, 17367, 37019, 78579, 166271, 350735, 737891, 1548587, 3242823, 6776903, 14136363, 29437795, 61205775, 127071871, 263464435, 545570203, 1128423127, 2331411639, 4811954107]

cp's OEIS Frontend

A127978 a(n) = ((15n + 34)/54)2^(n-1) - (-1)^(n-1)(6n + 5)/27.

Table of values

List of values

cp's OEIS Frontend

A127978 a(n) = ((15*n + 34)/54)*2^(n-1) - (-1)^(n-1)*(6*n + 5)/27.

Table of values

List of values

A127978 a(n) = ((15n + 34)/54)2^(n-1) - (-1)^(n-1)(6n + 5)/27.