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A056098 as a simple table

na(n)
31
42
55
617
768
8267
91230
105564
1127575
12136644
13714772
143743265
1520353789
16110723361
17619347223
183464770044
1919801412122
20113178582936

[1,2,5,17,68,267,1230,5564,27575,136644,714772,
 3743265,20353789,110723361,619347223,3464770044,
 19801412122,113178582936]