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A055906 as a simple table

na(n)
01
1-1
22
3-5
412
5-17
6-62
7677
8-2840
9-1451
10119954
11-866857
12472540
1352538185
14-517302474
15410579683
1647022181040
17-542323525061
18101360204230
1974342770852033
20-905627986876452
21-1359339244442825
22186336992053330034

[1,-1,2,-5,12,-17,-62,677,-2840,-1451,119954,
 -866857,472540,52538185,-517302474,410579683,
 47022181040,-542323525061,101360204230,
 74342770852033,-905627986876452,-1359339244442825,
 186336992053330034]