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A123960 as a simple table

n a(n)
1 0
2 0
3 0
4 2
5 22
6 152
7 842
8 4084
9 18116
10 75408
11 299730
12 1152834
13 4338280
14 16126958
15 59713888
16 221713192
17 829301072
18 3132108250
19 11945717358
20 45938159040
21 177695375802
22 689616061412
23 2679197337100
24 10403108215760
25 40332521702522

[0,0,0,2,22,152,842,4084,18116,75408,299730,
 1152834,4338280,16126958,59713888,221713192,
 829301072,3132108250,11945717358,45938159040,
 177695375802,689616061412,2679197337100,
 10403108215760,40332521702522]

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Last modified May 23 03:04 EDT 2019. Contains 323507 sequences. (Running on oeis4.)