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A201684 as a simple table

na(n)
01
1-1
20
30
44
534
6274
72312
821034
9207790
102228892
1125890642
12324477994
134370180744
1463007469346
15968847653702
1615834053988732
17274170226919434
185015004366420178
1996645631069563928
201957433140982004026

[1,-1,0,0,4,34,274,2312,21034,207790,2228892,
 25890642,324477994,4370180744,63007469346,
 968847653702,15834053988732,274170226919434,
 5015004366420178,96645631069563928,
 1957433140982004026]