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A278135 as a simple table

n a(n)
2 0
3 0
4 0
5 0
6 1
7 9
8 51
9 236
10 979
11 3805
12 14190
13 51488
14 183333
15 644121
16 2241127
17 7741378
18 26593899
19 90971184
20 310159487
21 1054693058
22 3578948942
23 12124108632
24 41015411703
25 138597840864
26 467913141789
27 1578497031981
28 5321685955902
29 17931990439148
30 60397664457791
31 203355625940891

[0,0,0,0,1,9,51,236,979,3805,14190,51488,183333,
 644121,2241127,7741378,26593899,90971184,
 310159487,1054693058,3578948942,12124108632,
 41015411703,138597840864,467913141789,
 1578497031981,5321685955902,17931990439148,
 60397664457791,203355625940891]

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Last modified October 16 20:23 EDT 2019. Contains 328103 sequences. (Running on oeis4.)