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A188495 as a simple table

na(n)
00
11
22
34
410
536
6120
7368
81089
93304
1010168
1131312
1295880
13293120
14896824
152746569
168411818
1725756220
1878853410
19241421436
20739183568
212263249600
226929580817
2321216729488
2464960656448
25198894856144
26608971496032
271864533223584
285708777321872

[0,1,2,4,10,36,120,368,1089,3304,10168,31312,
 95880,293120,896824,2746569,8411818,25756220,
 78853410,241421436,739183568,2263249600,
 6929580817,21216729488,64960656448,198894856144,
 608971496032,1864533223584,5708777321872]