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A005477 as a simple table

na(n)
00
11
218
3420
416200
51138320
6152681760
740012315200
820727639504000
921349793828563200
1043852643645542617600
11179883715700853141120000
121474687052822610564537600000
1324170122236238340825650936320000

[0,1,18,420,16200,1138320,152681760,40012315200,
 20727639504000,21349793828563200,
 43852643645542617600,179883715700853141120000,
 1474687052822610564537600000,
 24170122236238340825650936320000]