A291986 - OEIS

A291986 as a simple table

n	a(n)
0	1
1	1
2	3
3	6
4	10
5	16
6	33
7	45
8	79
9	130
10	198
11	300
12	517
13	721
14	1155
15	1806
16	2674
17	3976
18	6441
19	9045
20	13975
21	21370
22	31230
23	46020
24	72301
25	101881
26	154443
27	233286
28	338410
29	496096
30	765393
31	1080765
32	1619359
33	2427250
34	3504438
35	5120220
36	7806037
37	11037601
38	16409235
39	24466686

[1,1,3,6,10,16,33,45,79,130,198,300,517,721,1155, 1806,2674,3976,6441,9045,13975,21370,31230,46020, 72301,101881,154443,233286,338410,496096,765393, 1080765,1619359,2427250,3504438,5120220,7806037, 11037601,16409235,24466686]