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A007418 as a simple table

na(n)
01
12
21
313
41
519
613
729
817
913
1097
11254983
121247
132593
144937
15137561
166673
1765082637
181058467
197254146201
201380290071
21390121079
223216636877
231870450393439
24536799743
25109336409527
268113510922983

[1,2,1,13,1,19,13,29,17,13,97,254983,1247,2593,
 4937,137561,6673,65082637,1058467,7254146201,
 1380290071,390121079,3216636877,1870450393439,
 536799743,109336409527,8113510922983]