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A125905 as a simple table

na(n)
01
1-4
215
3-56
4209
5-780
62911
7-10864
840545
9-151316
10564719
11-2107560
127865521
13-29354524
14109552575
15-408855776
161525870529
17-5694626340
1821252634831
19-79315912984
20296011017105
21-1104728155436
224122901604639
23-15386878263120
2457424611447841

[1,-4,15,-56,209,-780,2911,-10864,40545,-151316,
 564719,-2107560,7865521,-29354524,109552575,
 -408855776,1525870529,-5694626340,21252634831,
 -79315912984,296011017105,-1104728155436,
 4122901604639,-15386878263120,57424611447841]