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A308631 as a simple table

na(n)
31
42
57
615
736
880
9174
10371
11787
121644
133410
147031
1514423
1629455
1759948
18121656
19246302
20497661
211003864
222022143
234068597
248178131
2516425116
2632965907
2766125958
28132577442
29265700195
30532313023
311066152092

[1,2,7,15,36,80,174,371,787,1644,3410,7031,14423,
 29455,59948,121656,246302,497661,1003864,2022143,
 4068597,8178131,16425116,32965907,66125958,
 132577442,265700195,532313023,1066152092]