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A143980 as a simple table

n a(n)
1 0
2 0
3 0
4 0
5 1
6 6
7 21
8 56
9 126
10 252
11 462
12 792
13 1288
14 2016
15 3108
16 4928
17 8569
18 17154
19 38931
20 94164
21 229824
22 550088
23 1278662
24 2884752
25 6335005
26 13590930
27 28575315
28 59014620
29 119878606
30 239662236
31 471605976
32 913302656
33 1740247806
34 3262146492
35 6015853242

[0,0,0,0,1,6,21,56,126,252,462,792,1288,2016,3108,
 4928,8569,17154,38931,94164,229824,550088,1278662,
 2884752,6335005,13590930,28575315,59014620,
 119878606,239662236,471605976,913302656,
 1740247806,3262146492,6015853242]

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Last modified July 31 03:28 EDT 2021. Contains 346367 sequences. (Running on oeis4.)