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A264056 as a simple table

na(n)
18
2216
32592
432400
5450000
65760000
774880000
8988650000
912899250000
10168682500000
112210850000000
1228926562500000
13378597656250000
144956813281250000
1564881000000000000
16849285000000000000

[8,216,2592,32400,450000,5760000,74880000,
 988650000,12899250000,168682500000,2210850000000,
 28926562500000,378597656250000,4956813281250000,
 64881000000000000,849285000000000000]