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A343466 as a simple table

na(n)
14
2-6
324
4-66
5208
6-676
72344
8-8226
929144
10-104760
11381304
12-1398476
135162224
14-19172796
1571582944
16-268439586
171010580544
18-3817734596
1914467258264
20-54975633768
21209430787824
22-799644629556
233059510616424
24-11728124734476
2545035996273872
26-173215367702376
27667199944815064

[4,-6,24,-66,208,-676,2344,-8226,29144,-104760,
 381304,-1398476,5162224,-19172796,71582944,
 -268439586,1010580544,-3817734596,14467258264,
 -54975633768,209430787824,-799644629556,
 3059510616424,-11728124734476,45035996273872,
 -173215367702376,667199944815064]