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A191242 as a simple table

na(n)
11
21
33
412
550
6224
71054
85121
925509
10129591
11668811
123496740
1318481512
1498585788
15530068840
162869725800
1715630429306
1885589391884
19470905310206
202601941245750
2114432082902820
2280328808797750
23448527122885700
242511672193514250

[1,1,3,12,50,224,1054,5121,25509,129591,668811,
 3496740,18481512,98585788,530068840,2869725800,
 15630429306,85589391884,470905310206,
 2601941245750,14432082902820,80328808797750,
 448527122885700,2511672193514250]