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A160999 as a simple table

na(n)
01
12
25
312
431
584
6233
7656
81865
95338
1015355
1144342
12128455
13373100
141086087
153167634
169254009
1727074666
1879316491
19232633206
20683026535
212007327660
225904415195
2317381265934
2451203990457
25150945252394
26445252685313

[1,2,5,12,31,84,233,656,1865,5338,15355,44342,
 128455,373100,1086087,3167634,9254009,27074666,
 79316491,232633206,683026535,2007327660,
 5904415195,17381265934,51203990457,150945252394,
 445252685313]