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A177699 as a simple table

na(n)
00
10
22
3-3
412
5-40
6190
7-1071
87224
9-56232
10495898
11-4880755
1253005700
13-629398848
148110146070
15-112690225935
161679413757168
17-26719024870576
18451969255722162
19-8099650628337987
20153288815339260796

[0,0,2,-3,12,-40,190,-1071,7224,-56232,495898,
 -4880755,53005700,-629398848,8110146070,
 -112690225935,1679413757168,-26719024870576,
 451969255722162,-8099650628337987,
 153288815339260796]