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A171799 as a simple table

na(n)
01
12
220
3648
478608
537949472
674258600000
7589859028828288
818957096840069579008
92455889836782322072945152
101278835681226410156250000000000
112671465293024628033252951422140418048

[1,2,20,648,78608,37949472,74258600000,
 589859028828288,18957096840069579008,
 2455889836782322072945152,
 1278835681226410156250000000000,
 2671465293024628033252951422140418048]