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A244524
as a simple table
n
a(n)
0
1
1
1
2
4
3
26
4
236
5
2780
6
40642
7
715836
8
14873174
9
358866952
10
9934283924
11
312461402424
[1,1,4,26,236,2780,40642,715836,14873174, 358866952,9934283924,312461402424]