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A009454 as a simple table

na(n)
00
11
2-1
31
40
5-10
690
7-730
86160
9-55900
10549900
11-5864300
1267610400
13-839594600
1411186357000
15-159300557000
162416003824000
17-38894192662000
18662595375078000
19-11911522255750000
20225382826562400000

[0,1,-1,1,0,-10,90,-730,6160,-55900,549900,
 -5864300,67610400,-839594600,11186357000,
 -159300557000,2416003824000,-38894192662000,
 662595375078000,-11911522255750000,
 225382826562400000]