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A015568 as a simple table

na(n)
00
11
27
359
4483
53971
632627
7268099
82202963
918101731
10148741747
111222209539
1210042884243
1382522285091
14678084838067
155571816717379
1645783565402323
17376203124990051
183091257528953587
1925400833952575619
20208718412957565203
211715037230228712611
2214092444741176640307

[0,1,7,59,483,3971,32627,268099,2202963,18101731,
 148741747,1222209539,10042884243,82522285091,
 678084838067,5571816717379,45783565402323,
 376203124990051,3091257528953587,
 25400833952575619,208718412957565203,
 1715037230228712611,14092444741176640307]