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A060238 as a simple table

na(n)
01
11
2-2
312
4-48
5960
611520
7-483840
83870720
9-69672960
10-2786918400
11306561024000
127357464576000
13-1147764473856000
14-96412215803904000
15-11569465896468480000
16185111454343495680000
17-50350315581430824960000
18-1812611360931509698560000

[1,1,-2,12,-48,960,11520,-483840,3870720,
 -69672960,-2786918400,306561024000,7357464576000,
 -1147764473856000,-96412215803904000,
 -11569465896468480000,185111454343495680000,
 -50350315581430824960000,
 -1812611360931509698560000]