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A013812 as a simple table

na(n)
020
13200000
2512000000000
381920000000000000
413107200000000000000000
52097152000000000000000000000
6335544320000000000000000000000000
753687091200000000000000000000000000000
88589934592000000000000000000000000000000000

[20,3200000,512000000000,81920000000000000,
 13107200000000000000000,
 2097152000000000000000000000,
 335544320000000000000000000000000,
 53687091200000000000000000000000000000,
 8589934592000000000000000000000000000000000]