A191007 - cp's OEIS frontend

A191007 a(n) = n*2^(n+1) + (2^(n+3)+(-1)^n)/3.

n	a(n)
0	3
1	9
2	27
3	69
4	171
5	405
6	939
7	2133
8	4779
9	10581
10	23211
11	50517
12	109227
13	234837
14	502443
15	1070421
16	2271915
17	4805973
18	10136235
19	21321045
20	44739243
21	93672789
22	195734187
23	408245589
24	850045611
25	1767200085
26	3668617899
27	7605671253
28	15748213419
29	32570168661
30	67287820971

[3, 9, 27, 69, 171, 405, 939, 2133, 4779, 10581, 23211, 50517, 109227, 234837, 502443, 1070421, 2271915, 4805973, 10136235, 21321045, 44739243, 93672789, 195734187, 408245589, 850045611, 1767200085, 3668617899, 7605671253, 15748213419, 32570168661, 67287820971]

cp's OEIS Frontend

A191007 a(n) = n*2^(n+1) + (2^(n+3)+(-1)^n)/3.

Table of values

List of values