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A172393 as a simple table

na(n)
01
14
2-2
38
4-20
596
6-324
71648
8-6348
933200
10-137848
11732640
12-3193296
1317148608
14-77335400
15418289696
16-1934677436
1710518803376
18-49611450120
19270796872160
20-1297234193744
217102371571840
22-34458382484976
23189117499963840

[1,4,-2,8,-20,96,-324,1648,-6348,33200,-137848,
 732640,-3193296,17148608,-77335400,418289696,
 -1934677436,10518803376,-49611450120,270796872160,
 -1297234193744,7102371571840,-34458382484976,
 189117499963840]