A000980 - cp's OEIS frontend

A000980 Number of ways of writing 0 as Sum_{k=-n..n} e(k)*k, where e(k) is 0 or 1.

n	a(n)
0	2
1	4
2	8
3	20
4	52
5	152
6	472
7	1520
8	5044
9	17112
10	59008
11	206260
12	729096
13	2601640
14	9358944
15	33904324
16	123580884
17	452902072
18	1667837680
19	6168510256
20	22903260088
21	85338450344
22	318995297200
23	1195901750512
24	4495448217544
25	16940411201280
26	63983233268592

[2, 4, 8, 20, 52, 152, 472, 1520, 5044, 17112, 59008, 206260, 729096, 2601640, 9358944, 33904324, 123580884, 452902072, 1667837680, 6168510256, 22903260088, 85338450344, 318995297200, 1195901750512, 4495448217544, 16940411201280, 63983233268592]

cp's OEIS Frontend

A000980 Number of ways of writing 0 as Sum_{k=-n..n} e(k)*k, where e(k) is 0 or 1.

Table of values

List of values