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A137788 as a simple table

na(n)
1-8
2-18
3-8
4318
53352
626142
7183112
81216638
97842232
1049591902
11309595432
121915328958
1311771279512
1471987413662
15438579282952
162664183937278
1716146410851192
1897676152243422
19590010212989672
203559688008961598
2121455704973213272
22129219894479953182
23777738831202779592

[-8,-18,-8,318,3352,26142,183112,1216638,7842232,
 49591902,309595432,1915328958,11771279512,
 71987413662,438579282952,2664183937278,
 16146410851192,97676152243422,590010212989672,
 3559688008961598,21455704973213272,
 129219894479953182,777738831202779592]