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A211774 as a simple table

n a(n)
0 0
1 0
2 0
3 3
4 12
5 60
6 420
7 3255
8 28056
9 270144
10 2868840
11 33293205
12 419329020
13 5697423732
14 83069039508
15 1293734268645
16 21436030749840
17 376516868504160
18 6988441065717744
19 136675039085498691
20 2809247116432575420
21 60543293881318183740
22 1365186080156105513460

[0,0,0,3,12,60,420,3255,28056,270144,2868840,
 33293205,419329020,5697423732,83069039508,
 1293734268645,21436030749840,376516868504160,
 6988441065717744,136675039085498691,
 2809247116432575420,60543293881318183740,
 1365186080156105513460]

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Last modified January 22 23:00 EST 2019. Contains 319365 sequences. (Running on oeis4.)