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A036939 as a simple table

na(n)
12
229
3229
42999
522229
60
72222929
822229299
9222229229
102222229299
1122222229299
120
132222222229229
1422222222222229
15222222222229229
162222222222229299
1722222222222922299
180
192222222222222292929

[2,29,229,2999,22229,0,2222929,22229299,222229229,
 2222229299,22222229299,0,2222222229229,
 22222222222229,222222222229229,2222222222229299,
 22222222222922299,0,2222222222222292929]