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A007173 as a simple table

n a(n)
1 1
2 1
3 1
4 4
5 10
6 40
7 171
8 831
9 4147
10 21822
11 117062
12 642600
13 3582322
14 20256885
15 115888201
16 669911568
17 3907720521
18 22979343010
19 136107859377
20 811430160282
21 4866004426320
22 29337068299728
23 177738920836446
24 1081668278379000
25 6609923004626478
26 40546403939165805

[1,1,1,4,10,40,171,831,4147,21822,117062,642600,
 3582322,20256885,115888201,669911568,3907720521,
 22979343010,136107859377,811430160282,
 4866004426320,29337068299728,177738920836446,
 1081668278379000,6609923004626478,
 40546403939165805]

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Last modified January 29 07:03 EST 2020. Contains 331337 sequences. (Running on oeis4.)