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A368562 as a simple table

na(n)
21
31
44
522
6144
71064
88623
975267
10698898
116843478
1270209485
13751028445
148344927123
1596028777007
161141700185040
1713996586957076
18176645358631455
192291885063335367
2030533724487796062
21417268607544901628
225843943369536347505
2383810410526002091163
241229907906811449747716

[1,1,4,22,144,1064,8623,75267,698898,6843478,
 70209485,751028445,8344927123,96028777007,
 1141700185040,13996586957076,176645358631455,
 2291885063335367,30533724487796062,
 417268607544901628,5843943369536347505,
 83810410526002091163,1229907906811449747716]