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A263423 as a simple table

na(n)
16
2961
3532620
4141086884
534502512032
69414955824400
72581177525941432
8696932281399739401
9188117459428481322624
1050895976667736734492176
1113771969942166582196102000
123725144577531136163481836521

[6,961,532620,141086884,34502512032,9414955824400,
 2581177525941432,696932281399739401,
 188117459428481322624,50895976667736734492176,
 13771969942166582196102000,
 3725144577531136163481836521]