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A127691 as a simple table

na(n)
0-1
10
20
32
464
52002
669264
72697354
8117899520
95740530914
10308814720400
1118213955960378
121169672907313728
1381286160430474066
146080123714344570128
15487166244246501489002
1641636260100744439399424
173781449867356996500139458
18363724112817207189865471248

[-1,0,0,2,64,2002,69264,2697354,117899520,
 5740530914,308814720400,18213955960378,
 1169672907313728,81286160430474066,
 6080123714344570128,487166244246501489002,
 41636260100744439399424,3781449867356996500139458,
 363724112817207189865471248]