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A267192 as a simple table

n a(n)
0 0
1 0
2 0
3 1
4 4
5 19
6 70
7 261
8 914
9 3177
10 10816
11 36566
12 122552
13 408840
14 1358032
15 4497995
16 14862112
17 49019688
18 161449208
19 531152855
20 1745892452
21 5734722698
22 18826352472
23 61777432510
24 202648614072
25 664569581090
26 2178948104572
27 7143067052707
28 23413795288008

[0,0,0,1,4,19,70,261,914,3177,10816,36566,122552,
 408840,1358032,4497995,14862112,49019688,
 161449208,531152855,1745892452,5734722698,
 18826352472,61777432510,202648614072,664569581090,
 2178948104572,7143067052707,23413795288008]

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Last modified December 14 17:55 EST 2019. Contains 329979 sequences. (Running on oeis4.)