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A303651 as a simple table

na(n)
01
13
215
3100
4840
58589
6104104
71463760
823457780
9422352880
108443603509
11185620024044
124450814005365
13115607871091860
143233811469903935
1596919878129098048
163098520826729103844
17105255099799959987720
183785952834976524485140
19143750180460098987633040
205745630052052437089326175
21241143250707191288860686084
2210603124545177769605263358275
23487432649463606266257377179400

[1,3,15,100,840,8589,104104,1463760,23457780,
 422352880,8443603509,185620024044,4450814005365,
 115607871091860,3233811469903935,
 96919878129098048,3098520826729103844,
 105255099799959987720,3785952834976524485140,
 143750180460098987633040,
 5745630052052437089326175,
 241143250707191288860686084,
 10603124545177769605263358275,
 487432649463606266257377179400]