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A172730 as a simple table

na(n)
10
20
30
40
5120
6971853075
736012988082548233
84263492449580925474047120
91609379339428507638996616962234528
101856926911618773209041555011161165016996700

[0,0,0,0,120,971853075,36012988082548233,
 4263492449580925474047120,
 1609379339428507638996616962234528,
 1856926911618773209041555011161165016996700]