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A137731 as a simple table

na(n)
11
21
32
47
540
6355
74720
891690
92559980
10101724390
115724370860
12455400049575
1351225573119870
148155535394029685
151840116104410154380
16589128078915179209630
17267942956094193363173030
18173296035183231212307098790
19159532934947213401229226873410

[1,1,2,7,40,355,4720,91690,2559980,101724390,
 5724370860,455400049575,51225573119870,
 8155535394029685,1840116104410154380,
 589128078915179209630,267942956094193363173030,
 173296035183231212307098790,
 159532934947213401229226873410]