A369628 - cp's OEIS frontend

A369628 Number of solutions to k_1 + 2k_2 + ... + nk_n = 1, where k_i are from {-1,0,1}, i=1..n.

n	a(n)
0	0
1	1
2	2
3	3
4	6
5	15
6	36
7	85
8	213
9	549
10	1423
11	3723
12	9882
13	26508
14	71579
15	194533
16	532120
17	1463561
18	4044075
19	11221727
20	31260192
21	87386579
22	245058185
23	689209348
24	1943530845
25	5494106583
26	15566303698
27	44196212866
28	125727934145
29	358317169828
30	1022916667066
31	2924843243594

[0, 1, 2, 3, 6, 15, 36, 85, 213, 549, 1423, 3723, 9882, 26508, 71579, 194533, 532120, 1463561, 4044075, 11221727, 31260192, 87386579, 245058185, 689209348, 1943530845, 5494106583, 15566303698, 44196212866, 125727934145, 358317169828, 1022916667066, 2924843243594]

cp's OEIS Frontend

A369628 Number of solutions to k_1 + 2k_2 + ... + nk_n = 1, where k_i are from {-1,0,1}, i=1..n.

Table of values

List of values

cp's OEIS Frontend

A369628 Number of solutions to k_1 + 2*k_2 + ... + n*k_n = 1, where k_i are from {-1,0,1}, i=1..n.

Table of values

List of values

A369628 Number of solutions to k_1 + 2k_2 + ... + nk_n = 1, where k_i are from {-1,0,1}, i=1..n.