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A207972 as a simple table

n a(n)
0 1
1 5
2 20
3 115
4 1665
5 82650
6 12847310
7 5620114060
8 6659421195205
9 21082748688390045
10 177217804775828062850
11 3941798437750184226876305
12 231505293200405380457355524620
13 35848160499603817968830380832049915
14 14619744406297572472084577939841875791890

[1,5,20,115,1665,82650,12847310,5620114060,
 6659421195205,21082748688390045,
 177217804775828062850,3941798437750184226876305,
 231505293200405380457355524620,
 35848160499603817968830380832049915,
 14619744406297572472084577939841875791890]

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Last modified December 8 14:38 EST 2019. Contains 329865 sequences. (Running on oeis4.)