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A105479 as a simple table

n a(n)
0 0
1 0
2 1
3 3
4 12
5 50
6 225
7 1092
8 5684
9 31572
10 186300
11 1163085
12 7654350
13 52928460
14 383437327
15 2902665885
16 22907918640
17 188082362120
18 1603461748491
19 14169892736484
20 129594593170210
21 1224875863061970
22 11948280552370932

[0,0,1,3,12,50,225,1092,5684,31572,186300,1163085,
 7654350,52928460,383437327,2902665885,22907918640,
 188082362120,1603461748491,14169892736484,
 129594593170210,1224875863061970,
 11948280552370932]

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Last modified January 19 12:48 EST 2020. Contains 331049 sequences. (Running on oeis4.)