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A012702 as a simple table

na(n)
01
10
20
30
4-12
560
6-570
73780
8-36288
9290304
10-3077160
1127976080
12-325364952
133125330208
14-38076353952
15320524495200
16-3277240862208
17-12892686066816
18851147013155904
19-38579486635656576
201000229709289596288

[1,0,0,0,-12,60,-570,3780,-36288,290304,-3077160,
 27976080,-325364952,3125330208,-38076353952,
 320524495200,-3277240862208,-12892686066816,
 851147013155904,-38579486635656576,
 1000229709289596288]