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A300559 as a simple table

na(n)
01
12
27
337
4241
51801
615121
7141121
81451521
916329601
10199584001
112634508801
1237362124801
13566658892801
149153720576001
15156920924160001
162845499424768001
1754420176498688001
181094805903679488001
1923112569077678080001
20510909421717094400001
2111802007641664880640001

[1,2,7,37,241,1801,15121,141121,1451521,16329601,
 199584001,2634508801,37362124801,566658892801,
 9153720576001,156920924160001,2845499424768001,
 54420176498688001,1094805903679488001,
 23112569077678080001,510909421717094400001,
 11802007641664880640001]