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A160474 as a simple table

na(n)
2-1
351
4-10
5-10594
62961
7-210
8356487
9-115940
1012642
11-420
12-101141295
1335804857
14-4751890
15254562
16-4620
1748350824787
18-18071509911
192689347661
20-180909586
215471466
22-60060

[-1,51,-10,-10594,2961,-210,356487,-115940,12642,
 -420,-101141295,35804857,-4751890,254562,-4620,
 48350824787,-18071509911,2689347661,-180909586,
 5471466,-60060]