login

A115142 as a simple table

na(n)
01
1-3
20
3-1
4-3
5-9
6-28
7-90
8-297
9-1001
10-3432
11-11934
12-41990
13-149226
14-534888
15-1931540
16-7020405
17-25662825
18-94287120
19-347993910
20-1289624490
21-4796857230
22-17902146600
23-67016296620
24-251577050010
25-946844533674
26-3572042254128
27-13505406670700

[1,-3,0,-1,-3,-9,-28,-90,-297,-1001,-3432,-11934,
 -41990,-149226,-534888,-1931540,-7020405,
 -25662825,-94287120,-347993910,-1289624490,
 -4796857230,-17902146600,-67016296620,
 -251577050010,-946844533674,-3572042254128,
 -13505406670700]