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A121376 as a simple table

na(n)
1-1
26
333
4380
53535
6189714
7285929
8319735800
91160703963
10145739620510
1186294277091
1210914811650686580
1360229285882649
14163637596919801624970
153392462704290802545
16669084376596453009616
17370468452361579892135179
18157145213515550643044429571846

[-1,6,33,380,3535,189714,285929,319735800,
 1160703963,145739620510,86294277091,
 10914811650686580,60229285882649,
 163637596919801624970,3392462704290802545,
 669084376596453009616,370468452361579892135179,
 157145213515550643044429571846]