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A207868 as a simple table

na(n)
11
21
31
42
54
62
75
834
934
105
1115
12500
132052
14500
1515
1652
1710900
18278982
19278982
2010900
2152
22203
23322768
2468162042
25455546040
2668162042
27322768
28203
29877
3012297768
3126419793726
321625686993918
331625686993918
3426419793726
3512297768
36877

[1,1,1,2,4,2,5,34,34,5,15,500,2052,500,15,52,
 10900,278982,278982,10900,52,203,322768,68162042,
 455546040,68162042,322768,203,877,12297768,
 26419793726,1625686993918,1625686993918,
 26419793726,12297768,877]