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A115138 as a simple table

na(n)
01
1-1
21
315
4113
5783
65361
736879
8255985
91794063
1012689393
1190505231
12650379249
134705157135
1434244198385
15250572963855
161842382110705
1713605619630095
18100872203796465
19750556607938575
205602962592235505
2141952165966643215
22314983352736153585

[1,-1,1,15,113,783,5361,36879,255985,1794063,
 12689393,90505231,650379249,4705157135,
 34244198385,250572963855,1842382110705,
 13605619630095,100872203796465,750556607938575,
 5602962592235505,41952165966643215,
 314983352736153585]