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A261481 as a simple table

na(n)
51
63
714
844
9138
10458
111397
124219
1312974
1439270
15118004
16355924
171071425
183217011
199662070
2029016280
2187083486
22261322358
23784185253
242352907211
257059288006
2621179391714
2763541238088
28190628647440
29571896993217
301715715461187
315147189398142
3215441653075684

[1,3,14,44,138,458,1397,4219,12974,39270,118004,
 355924,1071425,3217011,9662070,29016280,87083486,
 261322358,784185253,2352907211,7059288006,
 21179391714,63541238088,190628647440,571896993217,
 1715715461187,5147189398142,15441653075684]