A318975 - OEIS

A318975 as a simple table

n	a(n)
0	1
1	2
2	4
3	10
4	20
5	42
6	80
7	154
8	288
9	522
10	940
11	1658
12	2892
13	4970
14	8456
15	14218
16	23696
17	39122
18	64044
19	104042
20	167732
21	268602
22	427248
23	675482
24	1061632
25	1659298
26	2579676
27	3990418
28	6142892
29	9412906
30	14360136
31	21814698
32	33004704
33	49739426
34	74677924
35	111713658

[1,2,4,10,20,42,80,154,288,522,940,1658,2892,4970, 8456,14218,23696,39122,64044,104042,167732,268602, 427248,675482,1061632,1659298,2579676,3990418, 6142892,9412906,14360136,21814698,33004704, 49739426,74677924,111713658]