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A329174
as a simple table
n
a(n)
0
1
1
4
2
20
3
74
4
154
5
499
6
510
7
4411
8
6984
9
33836
10
61282
11
709339
12
1570651
[1,4,20,74,154,499,510,4411,6984,33836,61282, 709339,1570651]