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A009779 as a simple table

na(n)
00
10
22
3-6
414
5-20
6-36
7336
8720
9-38016
10524160
11-5448960
1250388480
13-465903360
145010888960
15-69353625600
161155961497600
17-20593469030400
18370356373094400
19-6695551947571200
20124010190839808000
21-2408196729028608000

[0,0,2,-6,14,-20,-36,336,720,-38016,524160,
 -5448960,50388480,-465903360,5010888960,
 -69353625600,1155961497600,-20593469030400,
 370356373094400,-6695551947571200,
 124010190839808000,-2408196729028608000]