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A013049 as a simple table

na(n)
01
1-4
2-8
3122
45352
5239494
614203028
71067540778
894081990576
98737926966734
10612930093492268
11-75242844404703342
12-70546032648374158392
13-35348193779396075142282
14-16607148139155135705120508
15-8041224802288813510222074374
16-4132501715459889292923513686176

[1,-4,-8,122,5352,239494,14203028,1067540778,
 94081990576,8737926966734,612930093492268,
 -75242844404703342,-70546032648374158392,
 -35348193779396075142282,
 -16607148139155135705120508,
 -8041224802288813510222074374,
 -4132501715459889292923513686176]