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A013558 as a simple table

na(n)
00
11
21
34
43
533
6155
71195
85418
972373
10496027
116851051
1259706592
13986009607
1410430165629
15193892831665
162439695949632
1750409517110169
18737532991565959
1916755308524034767
20279581740874221016

[0,1,1,4,3,33,155,1195,5418,72373,496027,6851051,
 59706592,986009607,10430165629,193892831665,
 2439695949632,50409517110169,737532991565959,
 16755308524034767,279581740874221016]