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A063101 as a simple table

na(n)
01
11
22
34
418
536
696
7144
8336
91120
10960
11960
124320
135760
149504
1529568
16161280
1780640
18884736
19110592
20155520
21460800
22729600
232188800
24929280
251300992
262040192
271298304
283528000
2914112000
3071884800
3171884800
3285708800
33243793920

[1,1,2,4,18,36,96,144,336,1120,960,960,4320,5760,
 9504,29568,161280,80640,884736,110592,155520,
 460800,729600,2188800,929280,1300992,2040192,
 1298304,3528000,14112000,71884800,71884800,
 85708800,243793920]