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A120787 as a simple table

na(n)
01
120
2200
31600
480000
51600000
616000000
71280000000
82560000000
9256000000000
102560000000000
11102400000000000
121024000000000000
134096000000000000
1440960000000000000
156553600000000000000

[1,20,200,1600,80000,1600000,16000000,1280000000,
 2560000000,256000000000,2560000000000,
 102400000000000,1024000000000000,4096000000000000,
 40960000000000000,6553600000000000000]