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A000556 as a simple table

na(n)
01
11
25
331
4257
52671
633305
7484471
88054177
9150635551
103130337705
1171556251911
121784401334897
1348205833997231
141402462784186105
1543716593539939351
161453550100421124417
1751350258701767067711
181920785418183176050505
1975839622064482770570791

[1,1,5,31,257,2671,33305,484471,8054177,150635551,
 3130337705,71556251911,1784401334897,
 48205833997231,1402462784186105,43716593539939351,
 1453550100421124417,51350258701767067711,
 1920785418183176050505,75839622064482770570791]