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A305446
as a simple table
n
a(n)
1
0
2
3
3
7
4
26
5
1275
6
5443
7
222961
8
10709608
9
362139243
10
59746224393
[0,3,7,26,1275,5443,222961,10709608,362139243, 59746224393]