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A001473 as a simple table

na(n)
10
20
30
46
530
6180
7840
85460
930996
10209160
111290960
129753480
1369618120
14571627056
154443697440
1640027718640
17346953934320
183369416698080
1931421601510336
20328430320909920
213331475969159520
2237124416523261760

[0,0,0,6,30,180,840,5460,30996,209160,1290960,
 9753480,69618120,571627056,4443697440,40027718640,
 346953934320,3369416698080,31421601510336,
 328430320909920,3331475969159520,
 37124416523261760]