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A271843 as a simple table

na(n)
11
21
31
43
58
620
755
8159
9464
101383
114200
1212910
1340112
14125832
15397888
161266848
174058263
1813070453
1942297553
20137467673
21448499679
221468388784
234822816903
2415886282268
2552468807845
26173718343364
27576466929104
281916968549390
296387086400663
3021319636605919
3171284279000874
32238724756808108
33800659887614429
342689098091847122

[1,1,1,3,8,20,55,159,464,1383,4200,12910,40112,
 125832,397888,1266848,4058263,13070453,42297553,
 137467673,448499679,1468388784,4822816903,
 15886282268,52468807845,173718343364,576466929104,
 1916968549390,6387086400663,21319636605919,
 71284279000874,238724756808108,800659887614429,
 2689098091847122]