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A261588 as a simple table

na(n)
01
11
22
35
414
542
6131
7420
81375
94576
1015431
1152603
12180957
13627340
142189430
157685785
1627118855
1796123508
18342099955
191221979374
204379357895
2115742077045
2256742085710
23205041235750
24742647580815
252695585363122
269803561513316
2735720226039252
28130373533268780

[1,1,2,5,14,42,131,420,1375,4576,15431,52603,
 180957,627340,2189430,7685785,27118855,96123508,
 342099955,1221979374,4379357895,15742077045,
 56742085710,205041235750,742647580815,
 2695585363122,9803561513316,35720226039252,
 130373533268780]