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A117255 as a simple table

na(n)
01
11
2-6
3224
4-39424
530277632
6-98180268032
71321338098679808
8-73064711504598663168
916493270769791857518968832
10-15132641904367108441083979235328
1156258298143912014448000446346897129472
12-845539117695226477286180063077230730209656832

[1,1,-6,224,-39424,30277632,-98180268032,
 1321338098679808,-73064711504598663168,
 16493270769791857518968832,
 -15132641904367108441083979235328,
 56258298143912014448000446346897129472,
 -845539117695226477286180063077230730209656832]