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A247639
as a simple table
n
a(n)
0
1
1
5
2
31
3
210
4
1488
5
10826
6
80111
7
599671
8
4525573
9
34357725
10
262011295
11
2004962487
12
15383479300
[1,5,31,210,1488,10826,80111,599671,4525573, 34357725,262011295,2004962487,15383479300]