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A136639 as a simple table

na(n)
01
12
2-6
328
4-410
5-40548
6-25678044
7-46695237064
8-261442466307066
9-4697327493273424596
10-282093987534237286507572
11-58573002543105566470447978872
12-43150254003464729476289222051517988
13-114953354885565948577897809039842112360424

[1,2,-6,28,-410,-40548,-25678044,-46695237064,
 -261442466307066,-4697327493273424596,
 -282093987534237286507572,
 -58573002543105566470447978872,
 -43150254003464729476289222051517988,
 -114953354885565948577897809039842112360424]