A163417 - cp's OEIS frontend

A163417 a(n) = 2^(floor((n-1)/2)) - n*(n-1)/2.

n	a(n)
1	1
2	0
3	-1
4	-4
5	-6
6	-11
7	-13
8	-20
9	-20
10	-29
11	-23
12	-34
13	-14
14	-27
15	23
16	8
17	120
18	103
19	341
20	322
21	814
22	793
23	1795
24	1772
25	3796
26	3771
27	7841
28	7814
29	15978
30	15949
31	32303
32	32272
33	65008
34	64975
35	130477
36	130442
37	261478
38	261441
39	523547
40	523508
41	1047756
42	1047715

[1, 0, -1, -4, -6, -11, -13, -20, -20, -29, -23, -34, -14, -27, 23, 8, 120, 103, 341, 322, 814, 793, 1795, 1772, 3796, 3771, 7841, 7814, 15978, 15949, 32303, 32272, 65008, 64975, 130477, 130442, 261478, 261441, 523547, 523508, 1047756, 1047715]

cp's OEIS Frontend

A163417 a(n) = 2^(floor((n-1)/2)) - n*(n-1)/2.

Table of values

List of values