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A375633 as a simple table

na(n)
01
11
24
315
484
5555
64440
741265
8438480
95240025
1069582240
111016350335
1216194911040
13279560396115
145197054262400
15103514720133825
162199255573715200
1749645309340451825
181186599954328588800
1929937224154635772975
20795051251297099596800

[1,1,4,15,84,555,4440,41265,438480,5240025,
 69582240,1016350335,16194911040,279560396115,
 5197054262400,103514720133825,2199255573715200,
 49645309340451825,1186599954328588800,
 29937224154635772975,795051251297099596800]