A127979 - cp's OEIS frontend

A127979 a(n) = (5n/18 + 19/54)2^n - (-1)^(n-1)(3n + 4)/27.

n	a(n)
1	1
2	4
3	9
4	24
5	55
6	130
7	293
8	660
9	1459
10	3206
11	6977
12	15096
13	32463
14	69482
15	148061
16	314332
17	665067
18	1402958
19	2951545
20	6194368
21	12971271
22	27107634
23	56545429
24	117751204
25	244823075
26	508287510
27	1053857713
28	2182280840
29	4513692479
30	9325646586

[1, 4, 9, 24, 55, 130, 293, 660, 1459, 3206, 6977, 15096, 32463, 69482, 148061, 314332, 665067, 1402958, 2951545, 6194368, 12971271, 27107634, 56545429, 117751204, 244823075, 508287510, 1053857713, 2182280840, 4513692479, 9325646586]

cp's OEIS Frontend

A127979 a(n) = (5n/18 + 19/54)2^n - (-1)^(n-1)(3n + 4)/27.

Table of values

List of values

cp's OEIS Frontend

A127979 a(n) = (5*n/18 + 19/54)*2^n - (-1)^(n-1)*(3*n + 4)/27.

Table of values

List of values

A127979 a(n) = (5n/18 + 19/54)2^n - (-1)^(n-1)(3n + 4)/27.