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A111687 as a simple table

na(n)
18
2144
35760
4362880
539916800
66227020800
71482030950400
8422378820864000
9155435406077952000
1081137281972690944000
1150305114823068385280000
1239087074217524135362560000
1335256540944206770097029120000

[8,144,5760,362880,39916800,6227020800,
 1482030950400,422378820864000,155435406077952000,
 81137281972690944000,50305114823068385280000,
 39087074217524135362560000,
 35256540944206770097029120000]