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A180038 as a simple table

na(n)
01
12
212
364
4344
51848
69928
753336
8286536
91539352
108269832
1144427864
12238678984
131282250648
146888611208
1537007557336
16198815009096
171068090160152
185738080818952
1930826584415064
20165609083713224
21889698587396248

[1,2,12,64,344,1848,9928,53336,286536,1539352,
 8269832,44427864,238678984,1282250648,6888611208,
 37007557336,198815009096,1068090160152,
 5738080818952,30826584415064,165609083713224,
 889698587396248]