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A009050 as a simple table

na(n)
01
10
2-12
3120
4784
5-95040
63292608
7-9423232
8-9230042880
9890079012864
10-40083887897600
11-2468650419873792
12837675174905843712
13-109581967679961088000
145834566862721760149504

[1,0,-12,120,784,-95040,3292608,-9423232,
 -9230042880,890079012864,-40083887897600,
 -2468650419873792,837675174905843712,
 -109581967679961088000,5834566862721760149504]