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A006841 as a simple table

na(n)
11
21
31
42
54
610
728
8127
9686
104975
1142529
12420948
134622509
1455670332
15726738971
1610217376792
17153848448652
182470073249960
1942120966152815
20760282326662191
2114481561464994821
22290289454462745374
236108699653117045614

[1,1,1,2,4,10,28,127,686,4975,42529,420948,
 4622509,55670332,726738971,10217376792,
 153848448652,2470073249960,42120966152815,
 760282326662191,14481561464994821,
 290289454462745374,6108699653117045614]