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A167368 as a simple table

na(n)
01
11
23
312
4159120
56686252969760
689050715142739003008099466232718435351438398888454549774336000

[1,1,3,12,159120,6686252969760,
 89050715142739003008099466232718435351438398888454\
 549774336000]