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A271673 as a simple table

na(n)
01
10
2180
35760
4355860
524226560
61923670800
7169658496000
816291413249300
91674631754611200
10181989927592033680
1120709782925396364800
122449425950787336166800
13299337868552812779289600
1437621311095831818078152000

[1,0,180,5760,355860,24226560,1923670800,
 169658496000,16291413249300,1674631754611200,
 181989927592033680,20709782925396364800,
 2449425950787336166800,299337868552812779289600,
 37621311095831818078152000]