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A337465 as a simple table

na(n)
01
15
2-6
3-139
41654
5-5853
6-196860
76258751
8-112580442
9985287863
1026443436876
11-1897380617625
1272596047613116
13-2086036395460171
1439493340495025864
15304974352009838745
16-85532651616832374010
176040114369000387188975
18-321378391411642082323524
1914224299551865677212271567

[1,5,-6,-139,1654,-5853,-196860,6258751,
 -112580442,985287863,26443436876,-1897380617625,
 72596047613116,-2086036395460171,
 39493340495025864,304974352009838745,
 -85532651616832374010,6040114369000387188975,
 -321378391411642082323524,
 14224299551865677212271567]