A127982 - cp's OEIS frontend

A127982 a(n) = (n - 1/3)*2^n - n/2 + 1/4 + (-1)^n/12.

n	a(n)
1	1
2	6
3	20
4	57
5	147
6	360
7	850
8	1959
9	4433
10	9894
11	21840
12	47781
13	103759
14	223908
15	480590
16	1026723
17	2184525
18	4631202
19	9786700
20	20621985
21	43341131
22	90876576
23	190141770
24	397060767
25	827675977
26	1722460830
27	3579139400
28	7426714269
29	15390299463

[1, 6, 20, 57, 147, 360, 850, 1959, 4433, 9894, 21840, 47781, 103759, 223908, 480590, 1026723, 2184525, 4631202, 9786700, 20621985, 43341131, 90876576, 190141770, 397060767, 827675977, 1722460830, 3579139400, 7426714269, 15390299463]

cp's OEIS Frontend

A127982 a(n) = (n - 1/3)*2^n - n/2 + 1/4 + (-1)^n/12.

Table of values

List of values