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A189002 as a simple table

na(n)
01
11
22
34
436
5192
66728
7100352
812988816
9557568000
10258584046368
1132565539635200
1253060477521960000
1319872369301840986112
14112202208776036178000000
15126231322912498539682594816
162444888770250892795802079170816
178326627661691818545121844900397056

[1,1,2,4,36,192,6728,100352,12988816,557568000,
 258584046368,32565539635200,53060477521960000,
 19872369301840986112,112202208776036178000000,
 126231322912498539682594816,
 2444888770250892795802079170816,
 8326627661691818545121844900397056]