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A203306 as a simple table

na(n)
01
11
21
320
4182160
527993556039680
64308936629569882673577984000
758707314863972899718827044647532534690532556800000
88707001005945253804913483804375384209011420702238388319242163029949808640000000000

[1,1,1,20,182160,27993556039680,
 4308936629569882673577984000,
 58707314863972899718827044647532534690532556800000\
 ,
 87070010059452538049134838043753842090114207022383\
 88319242163029949808640000000000]