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A109737 as a simple table

na(n)
01
10
20
356
415
556
6-1568
7-840
8-3248
986968
1068992
11282296
12-6003760
13-6303304
14-27159328
15461750072
16603190672
172734747960
18-37832026624
19-59193944264
20-282363230576
213227189573944
225897206565600
2329605080186808
24-282763446427952
25-593043518062408
26-3135137083770496

[1,0,0,56,15,56,-1568,-840,-3248,86968,68992,
 282296,-6003760,-6303304,-27159328,461750072,
 603190672,2734747960,-37832026624,-59193944264,
 -282363230576,3227189573944,5897206565600,
 29605080186808,-282763446427952,-593043518062408,
 -3135137083770496]