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A358949
as a simple table
n
a(n)
1
3
2
10
3
148
4
1111
5
9568
6
23770
7
126187
8
308401
9
855145
10
1521733
11
4591405
12
6831040
[3,10,148,1111,9568,23770,126187,308401,855145, 1521733,4591405,6831040]