A127980 - cp's OEIS frontend

A127980 a(n) = (n + 2/3)2^(n-1) - 1/2 - (-1)^(n-1)(1/6).

n	a(n)
1	1
2	5
3	14
4	37
5	90
6	213
7	490
8	1109
9	2474
10	5461
11	11946
12	25941
13	55978
14	120149
15	256682
16	546133
17	1157802
18	2446677
19	5155498
20	10835285
21	22719146
22	47535445
23	99265194
24	206918997
25	430615210
26	894784853
27	1856678570
28	3847574869
29	7963585194

[1, 5, 14, 37, 90, 213, 490, 1109, 2474, 5461, 11946, 25941, 55978, 120149, 256682, 546133, 1157802, 2446677, 5155498, 10835285, 22719146, 47535445, 99265194, 206918997, 430615210, 894784853, 1856678570, 3847574869, 7963585194]

cp's OEIS Frontend

A127980 a(n) = (n + 2/3)2^(n-1) - 1/2 - (-1)^(n-1)(1/6).

Table of values

List of values

cp's OEIS Frontend

A127980 a(n) = (n + 2/3)*2^(n-1) - 1/2 - (-1)^(n-1)*(1/6).

Table of values

List of values

A127980 a(n) = (n + 2/3)2^(n-1) - 1/2 - (-1)^(n-1)(1/6).