A128268 - OEIS

A128268 as a simple table

n	a(n)
0	1
1	1
2	2
3	12
4	2
5	90
6	2
7	770
8	2
9	5460
10	2
11	27870
12	2
13	86268
14	2
15	144
16	2
17	120632
18	2
19	4584054
20	2
21	1568502
22	2
23	147057998
24	2
25	1073923452
26	2
27	1324614852
28	2
29	74007713886
30	2
31	226457341710
32	2
33	735893320
34	2
35	2038112823132
36	2
37	86649033201030
38	2
39	4415363800

[1,1,2,12,2,90,2,770,2,5460,2,27870,2,86268,2,144, 2,120632,2,4584054,2,1568502,2,147057998,2, 1073923452,2,1324614852,2,74007713886,2, 226457341710,2,735893320,2,2038112823132,2, 86649033201030,2,4415363800]