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A148474 as a simple table

na(n)
01
11
22
36
420
565
6241
7889
83472
913622
1055340
11225557
12940725
133937330
1416738031
1571404967
16307999065
171332931401
185815439839
1925450058722
20112060278048
21494798567807
222195172975521
239763509301815
2443589884062136
25195052842541424
26875498008541850
273937713690439906
2817755851945737789

[1,1,2,6,20,65,241,889,3472,13622,55340,225557,
 940725,3937330,16738031,71404967,307999065,
 1332931401,5815439839,25450058722,112060278048,
 494798567807,2195172975521,9763509301815,
 43589884062136,195052842541424,875498008541850,
 3937713690439906,17755851945737789]