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A009964 as a simple table

na(n)
01
120
2400
38000
4160000
53200000
664000000
71280000000
825600000000
9512000000000
1010240000000000
11204800000000000
124096000000000000
1381920000000000000
141638400000000000000
1532768000000000000000

[1,20,400,8000,160000,3200000,64000000,1280000000,
 25600000000,512000000000,10240000000000,
 204800000000000,4096000000000000,
 81920000000000000,1638400000000000000,
 32768000000000000000]