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A006198 as a simple table

na(n)
11
21
36
441
5365
63984
751499
8769159
913031514
10246925295
115173842311
12118776068256
132964697094281
1479937923931761
152315462770608870
1671705109685449689
172364107330976587909
1882676528225908987824
193056806370495613000259
20119137361202296994159415

[1,1,6,41,365,3984,51499,769159,13031514,
 246925295,5173842311,118776068256,2964697094281,
 79937923931761,2315462770608870,71705109685449689,
 2364107330976587909,82676528225908987824,
 3056806370495613000259,119137361202296994159415]