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A020551 as a simple table

na(n)
05
15
229
31405
4333505
5207403201
6268740115201
7645241358764801
82642908298242867201
917340121313167797043201
10173401213127767018168320001
112538767161403063306670366720001
1252643875858853822296270152007680001

[5,5,29,1405,333505,207403201,268740115201,
 645241358764801,2642908298242867201,
 17340121313167797043201,
 173401213127767018168320001,
 2538767161403063306670366720001,
 52643875858853822296270152007680001]