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A220770 as a simple table

na(n)
01
13
29
320
449
5115
6343
7850
82401
96698
1018677
1152383
12148417
13418280
141184717
153357537
169518235
1727001128
1876637532
19217530615
20617624137
211753811531
224980521844
2314144892243
2440174244540
25114105904403
26324101321331
27920579535645
282614852152957

[1,3,9,20,49,115,343,850,2401,6698,18677,52383,
 148417,418280,1184717,3357537,9518235,27001128,
 76637532,217530615,617624137,1753811531,
 4980521844,14144892243,40174244540,114105904403,
 324101321331,920579535645,2614852152957]