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A113889 as a simple table

na(n)
10
273
30
40
577711
677713
77717
8719
97723
1077777777777777777729
1177731
12777737
137741
14743
1577747
167753
177759
18761
1977777777767
207777777777771
21773
22777777777777777777777777777777777777777777777777777777777777777779

[0,73,0,0,77711,77713,7717,719,7723,
 77777777777777777729,77731,777737,7741,743,77747,
 7753,7759,761,77777777767,7777777777771,773,
 77777777777777777777777777777777777777777777777777\
 7777777777777779]