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A239561 as a simple table

na(n)
01
11
21
32
44
58
616
731
863
9125
10252
11504
121013
132027
144069
158141
1616318
1732650
1865381
19130801
20261791
21523677
221047780
232095796
244192533
258385623
2616773321
2733547917
2867100362
29134203614
30268417029
31536840509
321073702131
332147418493
344294882224
358589795592

[1,1,1,2,4,8,16,31,63,125,252,504,1013,2027,4069,
 8141,16318,32650,65381,130801,261791,523677,
 1047780,2095796,4192533,8385623,16773321,33547917,
 67100362,134203614,268417029,536840509,1073702131,
 2147418493,4294882224,8589795592]