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A054769 as a simple table

na(n)
11
21
31
42
55
617
767
8324
91777
1011054
1176793
12591905
134987228
1445712331
15452511382
164812134735

[1,1,1,2,5,17,67,324,1777,11054,76793,591905,
 4987228,45712331,452511382,4812134735]