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A007768 as a simple table

na(n)
13
23
34
44
56
617
736
844
949
1074
11122
12126
13744
147814
159238
169432
1752114
1833241100
1985747623
20353210861
21355051655
221950030118
2332235431345
2450590143817
2558937626393
26482819610949
271515905452711
282679281166868
2925090147463646
30207012319502700

[3,3,4,4,6,17,36,44,49,74,122,126,744,7814,9238,
 9432,52114,33241100,85747623,353210861,355051655,
 1950030118,32235431345,50590143817,58937626393,
 482819610949,1515905452711,2679281166868,
 25090147463646,207012319502700]