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A056786
as a simple table
n
a(n)
0
1
1
1
2
4
3
26
4
255
5
2874
6
35520
7
454491
8
5954914
9
79238402
10
1067193518
[1,1,4,26,255,2874,35520,454491,5954914,79238402, 1067193518]