A120973 - OEIS

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A120973 as a simple table

n	a(n)
0	1
1	1
2	6
3	60
4	776
5	11802
6	201465
7	3759100
8	75404151
9	1608036861
10	36172106112
11	853346084343
12	21021015647574
13	538868533164995
14	14336235065928966
15	394957784033440194
16	11246848201518516044
17	330520280036501809758

[1,1,6,60,776,11802,201465,3759100,75404151, 1608036861,36172106112,853346084343, 21021015647574,538868533164995,14336235065928966, 394957784033440194,11246848201518516044, 330520280036501809758]