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A001920 as a simple table

na(n)
01
10
2-759
3-2576
4575322
53910368
6-429457542
7-4448043600
8315448497771
94479379753856
10-227641291795533
11-4209068502252768
12161001433246525844
133777687116090010816
14-111184747947285673452
15-3278809534641538686432

[1,0,-759,-2576,575322,3910368,-429457542,
 -4448043600,315448497771,4479379753856,
 -227641291795533,-4209068502252768,
 161001433246525844,3777687116090010816,
 -111184747947285673452,-3278809534641538686432]