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A349450 as a simple table

na(n)
11
2-1
3-2
4-4
5-14
6-38
7-132
8-420
9-1426
10-4834
11-16796
12-58688
13-208012
14-742636
15-2674384
16-9693976
17-35357670
18-129641774
19-477638700
20-1767253368
21-6564119892
22-24466233428
23-91482563640
24-343059494120
25-1289904147128
26-4861945985428
27-18367353066440
28-69533549429280
29-263747951750360
30-1002242211282032

[1,-1,-2,-4,-14,-38,-132,-420,-1426,-4834,-16796,
 -58688,-208012,-742636,-2674384,-9693976,
 -35357670,-129641774,-477638700,-1767253368,
 -6564119892,-24466233428,-91482563640,
 -343059494120,-1289904147128,-4861945985428,
 -18367353066440,-69533549429280,-263747951750360,
 -1002242211282032]