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A000393 as a simple table

n a(n)
1 0
2 0
3 0
4 0
5 0
6 0
7 1
8 6
9 26
10 94
11 308
12 941
13 2744
14 7722
15 21166
16 56809
17 149971
18 390517
19 1005491
20 2564164
21 6485901
22 16289602
23 40659669
24 100934017
25 249343899
26 613286048
27 1502515487
28 3667953650
29 8925161513
30 21652815724
31 52387028291

[0,0,0,0,0,0,1,6,26,94,308,941,2744,7722,21166,
 56809,149971,390517,1005491,2564164,6485901,
 16289602,40659669,100934017,249343899,613286048,
 1502515487,3667953650,8925161513,21652815724,
 52387028291]

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Last modified March 20 09:35 EDT 2019. Contains 321345 sequences. (Running on oeis4.)