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A219119 as a simple table

na(n)
01
11
22
312
496
51000
613500
7221718
84301808
997747200
102555001360
1175526842600
122503943418240
1392407030642056
143759862792921872
15167429488088545200
168120958429706093440
17426777425467443381120
1824161214872571127574400
191467122583066982481802816

[1,1,2,12,96,1000,13500,221718,4301808,97747200,
 2555001360,75526842600,2503943418240,
 92407030642056,3759862792921872,
 167429488088545200,8120958429706093440,
 426777425467443381120,24161214872571127574400,
 1467122583066982481802816]