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A176558 as a simple table

na(n)
11
221
331
4421
551
66321
771
88421
9931
1010521
11111
121264321
13131
1414721
1515531
16168421
17171
181896321
19191
2020105421
2121731
22221121
23231
242412864321
252551
26261321
2727931
2828147421
29291
3030151065321
31311
3232168421
33331131
34341721
3535751
36361812964321
37371

[1,21,31,421,51,6321,71,8421,931,10521,111,
 1264321,131,14721,15531,168421,171,1896321,191,
 20105421,21731,221121,231,2412864321,2551,261321,
 27931,28147421,291,30151065321,311,32168421,
 331131,341721,35751,361812964321,371]