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A183395 as a simple table

na(n)
18
28
369
4156
5451
62595
712150
858407
9280852
101405171
117015294
1234368476
13167469177
14825952633
154089662044
1620170838069
1799218328768
18488970338928
192413015142592
2011903686509071
2158695278806839
22289412617546604

[8,8,69,156,451,2595,12150,58407,280852,1405171,
 7015294,34368476,167469177,825952633,4089662044,
 20170838069,99218328768,488970338928,
 2413015142592,11903686509071,58695278806839,
 289412617546604]