A007576 - cp's OEIS frontend

A007576 Number of solutions to k_1 + 2k_2 + ... + nk_n = 0, where k_i are from {-1,0,1}, i=1..n.

n	a(n)
0	1
1	1
2	1
3	3
4	7
5	15
6	35
7	87
8	217
9	547
10	1417
11	3735
12	9911
13	26513
14	71581
15	194681
16	532481
17	1464029
18	4045117
19	11225159
20	31268577
21	87404465
22	245101771
23	689323849
24	1943817227
25	5494808425
26	15568077235
27	44200775239
28	125739619467

[1, 1, 1, 3, 7, 15, 35, 87, 217, 547, 1417, 3735, 9911, 26513, 71581, 194681, 532481, 1464029, 4045117, 11225159, 31268577, 87404465, 245101771, 689323849, 1943817227, 5494808425, 15568077235, 44200775239, 125739619467]

cp's OEIS Frontend

A007576 Number of solutions to k_1 + 2k_2 + ... + nk_n = 0, where k_i are from {-1,0,1}, i=1..n.

Table of values

List of values

cp's OEIS Frontend

A007576 Number of solutions to k_1 + 2*k_2 + ... + n*k_n = 0, where k_i are from {-1,0,1}, i=1..n.

Table of values

List of values

A007576 Number of solutions to k_1 + 2k_2 + ... + nk_n = 0, where k_i are from {-1,0,1}, i=1..n.