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A068199 as a simple table

na(n)
01
12
26
324
4114
5618
63732
724702
8177126
91363740
1011195286
1197437138
12894857712
138637708858
1487333790686
15922203924216
1610144109299146
17115972625504994
181375221840671220
1916884112119546534
20214270296662325534
212806600053170775372
2237892025089041181982

[1,2,6,24,114,618,3732,24702,177126,1363740,
 11195286,97437138,894857712,8637708858,
 87333790686,922203924216,10144109299146,
 115972625504994,1375221840671220,
 16884112119546534,214270296662325534,
 2806600053170775372,37892025089041181982]