A346776 - OEIS

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A346776 as a simple table

n	a(n)
0	0
1	0
2	0
3	0
4	2
5	3
6	6
7	15
8	28
9	58
10	132
11	254
12	515
13	1042
14	2088
15	4172
16	8337
17	16720
18	33556
19	66948
20	134088
21	268037
22	535435
23	1069932
24	2139357
25	4275948
26	8544351
27	17076036

[0,0,0,0,2,3,6,15,28,58,132,254,515,1042,2088, 4172,8337,16720,33556,66948,134088,268037,535435, 1069932,2139357,4275948,8544351,17076036]