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A180069 as a simple table

na(n)
20
32
42
56
634
7132
8448
91986
108422
1139902
12195946
131024366
145505428
1531185644
16183904498
171119250852
187025176096
1945663175776
20306194071810
212107066845486
2214874884490258
23107949634637898

[0,2,2,6,34,132,448,1986,8422,39902,195946,
 1024366,5505428,31185644,183904498,1119250852,
 7025176096,45663175776,306194071810,2107066845486,
 14874884490258,107949634637898]