A288550 - cp's OEIS frontend

A288550 Number of strings of n digits from 1...9 such that a signed summation of the digits exists making the sum = 0.

n	a(n)
0	1
1	0
2	9
3	108
4	1569
5	20230
6	229203
7	2278745
8	21214753
9	192899244
10	1741242069
11	15684465423
12	141196229849
13	1270871708340
14	11438182427193
15	102944790695746
16	926507214592705
17	8338579980466304
18	75047276148618205
19	675425698975426255
20	6078832109331582297

[1, 0, 9, 108, 1569, 20230, 229203, 2278745, 21214753, 192899244, 1741242069, 15684465423, 141196229849, 1270871708340, 11438182427193, 102944790695746, 926507214592705, 8338579980466304, 75047276148618205, 675425698975426255, 6078832109331582297]

cp's OEIS Frontend

A288550 Number of strings of n digits from 1...9 such that a signed summation of the digits exists making the sum = 0.

Table of values

List of values