A156181 - cp's OEIS frontend

A156181 Number of solutions to e(1)1 + e(2)2 + ... + e(n)n = e(-1)1 + e(-2)2 + ... + e(-n)n, where e(j) are from {-1,0,1}, j=-n,...,n.

n	a(n)
0	1
1	3
2	13
3	65
4	403
5	2669
6	18759
7	136477
8	1020373
9	7785741
10	60395165
11	474817833
12	3775005799
13	30298719855
14	245167429681
15	1997854542163
16	16381233095985
17	135050690760831
18	1118800428892925
19	9308791880014333
20	77755512086256649

[1, 3, 13, 65, 403, 2669, 18759, 136477, 1020373, 7785741, 60395165, 474817833, 3775005799, 30298719855, 245167429681, 1997854542163, 16381233095985, 135050690760831, 1118800428892925, 9308791880014333, 77755512086256649]

cp's OEIS Frontend

A156181 Number of solutions to e(1)1 + e(2)2 + ... + e(n)n = e(-1)1 + e(-2)2 + ... + e(-n)n, where e(j) are from {-1,0,1}, j=-n,...,n.

Table of values

List of values

cp's OEIS Frontend

A156181 Number of solutions to e(1)*1 + e(2)*2 + ... + e(n)*n = e(-1)*1 + e(-2)*2 + ... + e(-n)*n, where e(j) are from {-1,0,1}, j=-n,...,n.

Table of values

List of values

A156181 Number of solutions to e(1)1 + e(2)2 + ... + e(n)n = e(-1)1 + e(-2)2 + ... + e(-n)n, where e(j) are from {-1,0,1}, j=-n,...,n.