login

A261980 as a simple table

na(n)
01
12
2-2
3-4
414
524
6-92
7-176
8694
91342
10-5480
11-10612
1244532
1386408
14-369328
15-717616
163109078
176046724
18-26473950
19-51523620
20227477656
21442950880
22-1969014572
23-3835720208
2417147433572
2533415180858
26-150096433272
27-292574352808
281319581377424
292572787175656
30-11644937717296

[1,2,-2,-4,14,24,-92,-176,694,1342,-5480,-10612,
 44532,86408,-369328,-717616,3109078,6046724,
 -26473950,-51523620,227477656,442950880,
 -1969014572,-3835720208,17147433572,33415180858,
 -150096433272,-292574352808,1319581377424,
 2572787175656,-11644937717296]