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A004528 as a simple table

na(n)
01
11
22
34
48
524
696
7384
81536
97680
1046080
11276480
121658880
1311612160
1492897280
15743178240
165945425920
1753508833280
18535088332800
195350883328000
2053508833280000
21588597166080000
227063165992960000

[1,1,2,4,8,24,96,384,1536,7680,46080,276480,
 1658880,11612160,92897280,743178240,5945425920,
 53508833280,535088332800,5350883328000,
 53508833280000,588597166080000,7063165992960000]