A146448 - OEIS

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A146448 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	7
7	15
8	49
9	233
10	1205
11	7091
12	56369
13	554977
14	6653663
15	98474615
16	1800719003
17	40485995917
18	1128941883627
19	39031781085873
20	1652786153476941

[1,1,1,1,3,7,15,49,233,1205,7091,56369,554977, 6653663,98474615,1800719003,40485995917, 1128941883627,39031781085873,1652786153476941]