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A257300 as a simple table

na(n)
01
11
22
34
48
517
638
788
8210
9514
101285
113270
128447
1322100
1458455
15156077
16420153
171139155
183108095
198527675
2023514124
2165127571
22181111940
23505487115
241415502195
253975790024
2611197966459
2731619946886
2889496047586
29253858251337
30721531869889
312054639741185

[1,1,2,4,8,17,38,88,210,514,1285,3270,8447,22100,
 58455,156077,420153,1139155,3108095,8527675,
 23514124,65127571,181111940,505487115,1415502195,
 3975790024,11197966459,31619946886,89496047586,
 253858251337,721531869889,2054639741185]