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A000557 as a simple table

na(n)
01
12
28
350
4416
54322
653888
7783890
813031936
9243733442
105064992768
11115780447730
122887222009856
1377998677862562
142269232452763648
1570734934220015570
162351893466832306176
1783086463910558199682
183107896091715557654528
19122711086194279627711410

[1,2,8,50,416,4322,53888,783890,13031936,
 243733442,5064992768,115780447730,2887222009856,
 77998677862562,2269232452763648,70734934220015570,
 2351893466832306176,83086463910558199682,
 3107896091715557654528,122711086194279627711410]