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A318731 as a simple table

na(n)
11
20
31
42
55
67
717
827
954
1093
11185
12324
13629
141143
152175
164050
177709
1814469
1927593
2052276
2199839
22190371
23364721
24698508
251342170
262580165
274970952
289585232
2918512789
3035787985
3169273665
32134211600
33260300799
34505278705
35981706783

[1,0,1,2,5,7,17,27,54,93,185,324,629,1143,2175,
 4050,7709,14469,27593,52276,99839,190371,364721,
 698508,1342170,2580165,4970952,9585232,18512789,
 35787985,69273665,134211600,260300799,505278705,
 981706783]