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A056273 as a simple table

na(n)
01
11
22
35
415
552
6203
7876
84111
920648
10109299
11601492
123403127
1319628064
14114700315
15676207628
164010090463
1723874362200
18142508723651
19852124263684
205101098232519
2130560194493456
22183176170057707

[1,1,2,5,15,52,203,876,4111,20648,109299,601492,
 3403127,19628064,114700315,676207628,4010090463,
 23874362200,142508723651,852124263684,
 5101098232519,30560194493456,183176170057707]