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A263520 as a simple table

na(n)
18
235
3160
4660
52651
610350
739807
8151463
9572454
102153977
118081566
1230264786
13113201857
14423085492
151580453125
165901900685
1722034817900
1882255893847
19307033492332
201145986101448
214277171754383
2215963330711354
2359577671664211

[8,35,160,660,2651,10350,39807,151463,572454,
 2153977,8081566,30264786,113201857,423085492,
 1580453125,5901900685,22034817900,82255893847,
 307033492332,1145986101448,4277171754383,
 15963330711354,59577671664211]