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A013521 as a simple table

na(n)
01
1-1
2-7
3-97
4-2063
5-17803
6-250781
7166831871
843685848289
9447550424579
1084677077231169
1111657476758734011
1228924058075775365981
1344287070229737735633567
14305190813989360271816409

[1,-1,-7,-97,-2063,-17803,-250781,166831871,
 43685848289,447550424579,84677077231169,
 11657476758734011,28924058075775365981,
 44287070229737735633567,305190813989360271816409]