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A013308 as a simple table

na(n)
11
21
3-1
4-17
5109
6299
7-813
8-373177
99417917
10133861013
11-796664399
12-229876317317
13593496669853
14693397771163639
15-8404224858061139
16-282791345633671703
171818027079738117517
18978930433926331599667

[1,1,-1,-17,109,299,-813,-373177,9417917,
 133861013,-796664399,-229876317317,593496669853,
 693397771163639,-8404224858061139,
 -282791345633671703,1818027079738117517,
 978930433926331599667]