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A227295 as a simple table

na(n)
01
14
2-8
332
4-128
5768
6-4608
728672
8-184320
91212672
10-8127488
1155318528
12-381329408
132656845824
14-18680250368
15132373807104
16-944459216896
176778991403008
18-48915734839296
19354636355665920
20-2582006464118784
2118870792427143168
22-138396900373037056
231018196233480568832
24-7512565092559355904

[1,4,-8,32,-128,768,-4608,28672,-184320,1212672,
 -8127488,55318528,-381329408,2656845824,
 -18680250368,132373807104,-944459216896,
 6778991403008,-48915734839296,354636355665920,
 -2582006464118784,18870792427143168,
 -138396900373037056,1018196233480568832,
 -7512565092559355904]