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A009486 as a simple table

na(n)
00
12
2-8
3-88
46592
5-251488
64158592
7551599232
8-94759774208
99549823734272
10-506903275563008
11-67623197282080768
1230434079688615739392
13-6806476994628810661888
14994937886379415577198592

[0,2,-8,-88,6592,-251488,4158592,551599232,
 -94759774208,9549823734272,-506903275563008,
 -67623197282080768,30434079688615739392,
 -6806476994628810661888,994937886379415577198592]