A005508 - OEIS

A005508 as a simple table

n	a(n)
0	1
1	2
2	3
3	6
4	8
5	18
6	23
7	56
8	70
9	180
10	222
11	594
12	726
13	2002
14	2431
15	6864
16	8294
17	23868
18	28730
19	83980
20	100776
21	298452
22	357238
23	1069776
24	1277788
25	3863080
26	4605980
27	14040810
28	16715250
29	51325650
30	61020495
31	188574240
32	223931910
33	695987820
34	825632610
35	2579248980

[1,2,3,6,8,18,23,56,70,180,222,594,726,2002,2431, 6864,8294,23868,28730,83980,100776,298452,357238, 1069776,1277788,3863080,4605980,14040810,16715250, 51325650,61020495,188574240,223931910,695987820, 825632610,2579248980]