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A055603 as a simple table

na(n)
10
21
390
42248
543000
6755100
713003620
8226262400
94037765760
1074481120000
111425927888000
1228389466828800
13588245898240000
1412685887076262400
15284623499160000000
166639289429893120000
17160886197351047168000
184046412223559946240000
19105527367894862577664000

[0,1,90,2248,43000,755100,13003620,226262400,
 4037765760,74481120000,1425927888000,
 28389466828800,588245898240000,12685887076262400,
 284623499160000000,6639289429893120000,
 160886197351047168000,4046412223559946240000,
 105527367894862577664000]