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A375688 as a simple table

na(n)
01
10
22
33
456
5270
64824
744520
8866816
912195792
10267873120
115073187680
12126754229568
132999710359360
1485061489235072
152400155295632640
1676724104598031360
172502434971473937920
1889428428468644493312
193300036525511418327040

[1,0,2,3,56,270,4824,44520,866816,12195792,
 267873120,5073187680,126754229568,2999710359360,
 85061489235072,2400155295632640,76724104598031360,
 2502434971473937920,89428428468644493312,
 3300036525511418327040]