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A380576
as a simple table
n
a(n)
0
0
1
0
2
1
3
7
4
42
5
287
6
2186
7
18650
8
176408
9
1837189
10
20908724
11
258210463
12
3440203098
13
49202385314
14
752012692572
[0,0,1,7,42,287,2186,18650,176408,1837189, 20908724,258210463,3440203098,49202385314, 752012692572]