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A236988 as a simple table

na(n)
11
2-20
3140
4200
5-67600
63983200
7-228488000
814375920000
9-1002261520000
1074864404160000
11-5398716356800000
12221997813232000000
1354286859023072000000
14-27326116497867200000000
159481971502321385600000000
16-3155347494162485190400000000

[1,-20,140,200,-67600,3983200,-228488000,
 14375920000,-1002261520000,74864404160000,
 -5398716356800000,221997813232000000,
 54286859023072000000,-27326116497867200000000,
 9481971502321385600000000,
 -3155347494162485190400000000]