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A169815 as a simple table

na(n)
11
21
33
412
54500
69000
71512630000
81452124800000
9111152892816000000
103112280998848000000
111849326140334157445511936000000
12388358489470173063557506560000000
131607761625123067582500188167647056604083200000000

[1,1,3,12,4500,9000,1512630000,1452124800000,
 111152892816000000,3112280998848000000,
 1849326140334157445511936000000,
 388358489470173063557506560000000,
 1607761625123067582500188167647056604083200000000]