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A068128 as a simple table

na(n)
16
215
3105
4231
52211
63003
720301
8112101
92003001
10122000010
11200030001
1220000300001
132000003000001
14200000030000001
1520000000300000001
162000000003000000001
17200000000030000000001
1820000000000300000000001
192000000000003000000000001

[6,15,105,231,2211,3003,20301,112101,2003001,
 122000010,200030001,20000300001,2000003000001,
 200000030000001,20000000300000001,
 2000000003000000001,200000000030000000001,
 20000000000300000000001,2000000000003000000000001]