A180887 - OEIS

A180887 as a simple table

n	a(n)
1	2
2	3
3	3
4	6
5	12
6	6
7	10
8	50
9	50
10	10
11	20
12	160
13	360
14	160
15	20
16	35
17	525
18	1960
19	1960
20	525
21	35
22	70
23	1540
24	10010
25	17080
26	10010
27	1540
28	70
29	126
30	4662
31	45738
32	130914
33	130914
34	45738
35	4662
36	126
37	252
38	13104
39	203616
40	877968
41	1438920
42	877968
43	203616
44	13104
45	252
46	462
47	38346

[2,3,3,6,12,6,10,50,50,10,20,160,360,160,20,35, 525,1960,1960,525,35,70,1540,10010,17080,10010, 1540,70,126,4662,45738,130914,130914,45738,4662, 126,252,13104,203616,877968,1438920,877968,203616, 13104,252,462,38346]