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A261531 as a simple table

na(n)
01
11
21
32
42
54
615
725
869
9254
101799
114039
1216828
1361751
14349831
153485031
1610391139
1749433136
18240065255
191282012987
209167583734
21131550812011
22459677216341
232707382738559
2414318807603110
2594084166753927
26601900541251447
275894253303715375

[1,1,1,2,2,4,15,25,69,254,1799,4039,16828,61751,
 349831,3485031,10391139,49433136,240065255,
 1282012987,9167583734,131550812011,459677216341,
 2707382738559,14318807603110,94084166753927,
 601900541251447,5894253303715375]