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A115143 as a simple table

na(n)
01
1-4
22
30
4-1
5-4
6-14
7-48
8-165
9-572
10-2002
11-7072
12-25194
13-90440
14-326876
15-1188640
16-4345965
17-15967980
18-58929450
19-218349120
20-811985790
21-3029594040
22-11338026180
23-42550029600
24-160094486370
25-603784920024
26-2282138106804
27-8643460269248
28-32798844771700

[1,-4,2,0,-1,-4,-14,-48,-165,-572,-2002,-7072,
 -25194,-90440,-326876,-1188640,-4345965,-15967980,
 -58929450,-218349120,-811985790,-3029594040,
 -11338026180,-42550029600,-160094486370,
 -603784920024,-2282138106804,-8643460269248,
 -32798844771700]