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A006749 as a simple table

n a(n)
1 0
2 0
3 0
4 1
5 5
6 20
7 84
8 316
9 1196
10 4461
11 16750
12 62878
13 237394
14 899265
15 3422111
16 13069026
17 50091095
18 192583152
19 742560511
20 2870523142
21 11122817672
22 43191285751
23 168046076423
24 654997492842
25 2557223459805
26 9999080270766
27 39152997087077
28 153511067364760

[0,0,0,1,5,20,84,316,1196,4461,16750,62878,237394,
 899265,3422111,13069026,50091095,192583152,
 742560511,2870523142,11122817672,43191285751,
 168046076423,654997492842,2557223459805,
 9999080270766,39152997087077,153511067364760]

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Last modified September 16 18:24 EDT 2019. Contains 327116 sequences. (Running on oeis4.)