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A131726 as a simple table

n a(n)
0 0
1 0
2 0
3 0
4 10
5 20
6 70
7 160
8 400
9 980
10 2370
11 5740
12 13860
13 33460
14 80780
15 195020
16 470830
17 1136680
18 2744210
19 6625100
20 15994420
21 38613960

[0,0,0,0,10,20,70,160,400,980,2370,5740,13860,
 33460,80780,195020,470830,1136680,2744210,6625100,
 15994420,38613960]

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Last modified July 22 11:00 EDT 2019. Contains 325219 sequences. (Running on oeis4.)