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A261247 as a simple table

na(n)
12
23
34
45
539
66
7156
87
98
1059
119
121464
1310
14477
1511
162175
1712
1841571
1988
2013
212999
2214
23127539
24244
2515
26108
272489
2816
29373
30340551
3117
322068
334109
3418
357987764
3611427
3719
38137913
39406200
40137
41334
422709
4320
4412311
4521
4610496
4715732537
4840215912
491729
5022
517204587
52157
5364719

[2,3,4,5,39,6,156,7,8,59,9,1464,10,477,11,2175,12,
 41571,88,13,2999,14,127539,244,15,108,2489,16,373,
 340551,17,2068,4109,18,7987764,11427,19,137913,
 406200,137,334,2709,20,12311,21,10496,15732537,
 40215912,1729,22,7204587,157,64719]