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A259493
as a simple table
n
a(n)
1
0
2
1
3
21
4
148
5
1078
6
7898
7
60843
8
486390
9
3969956
10
33123937
11
280486145
12
2411806083
[0,1,21,148,1078,7898,60843,486390,3969956, 33123937,280486145,2411806083]