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A012480 as a simple table

na(n)
01
11
21
3-1
4-7
5-15
625
7359
81297
93713
10785
11347151
123237577
1362839153
14476552297
1510196506423
1693536269473
172397571040897
1825410713978785
19714196911010335
208498142387238425
21263318643848985457

[1,1,1,-1,-7,-15,25,359,1297,3713,785,347151,
 3237577,62839153,476552297,10196506423,
 93536269473,2397571040897,25410713978785,
 714196911010335,8498142387238425,
 263318643848985457]