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A172481 as a simple table

na(n)
01
12
25
311
425
555
6121
7263
8569
91223
102617
115575
1211833
1325031
1452793
15111047
16233017
17487879
181019449
192126279
204427321
219204167
2219107385
2339612871
2482021945
25169636295
26350457401
27723284423
281491308089
293072094663
306323146297
3113004206535
3226724240953

[1,2,5,11,25,55,121,263,569,1223,2617,5575,11833,
 25031,52793,111047,233017,487879,1019449,2126279,
 4427321,9204167,19107385,39612871,82021945,
 169636295,350457401,723284423,1491308089,
 3072094663,6323146297,13004206535,26724240953]