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A261894 as a simple table

na(n)
01
11
22
35
414
542
6131
7425
81405
94768
1016355
1157112
12200908
13715945
142563950
159275069
1633670472
17123183827
18451968108
191668602686
206173397451
2122959862085
2285535398344
23320037864300
241199162682255
254509735549128
2616979368985245
2764134400212097

[1,1,2,5,14,42,131,425,1405,4768,16355,57112,
 200908,715945,2563950,9275069,33670472,123183827,
 451968108,1668602686,6173397451,22959862085,
 85535398344,320037864300,1199162682255,
 4509735549128,16979368985245,64134400212097]