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A294978 as a simple table

na(n)
01
142
2-2268
3395304
4-64600914
511644170552
6-2188350306072
7424652412357696
8-84326944950450972
917044476557469661986
10-3493525880987663047128
11724189608821718233434296
12-151528575864988356484968840
1331955212589107172812017247992

[1,42,-2268,395304,-64600914,11644170552,
 -2188350306072,424652412357696,-84326944950450972,
 17044476557469661986,-3493525880987663047128,
 724189608821718233434296,
 -151528575864988356484968840,
 31955212589107172812017247992]