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A174250
as a simple table
n
a(n)
0
1
1
1
2
6
3
132
4
2369
5
33344
6
451206
7
5850115
8
81459922
9
1144259389
10
15946621499
[1,1,6,132,2369,33344,451206,5850115,81459922, 1144259389,15946621499]