A007199 - OEIS

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A007199 as a simple table

n	a(n)
1	1
2	3
3	12
4	55
5	273
6	1425
7	7695
8	42576
9	239925
10	1371555
11	7931817
12	46310127
13	272559558
14	1615163592
15	9627985773
16	57688721354
17	347228163630

[1,3,12,55,273,1425,7695,42576,239925,1371555, 7931817,46310127,272559558,1615163592,9627985773, 57688721354,347228163630]