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A278547 as a simple table

n a(n)
1 0
2 0
3 4
4 65
5 456
6 2128
7 7728
8 23607
9 63460
10 154518
11 347568
12 732524
13 1461824
14 2784600
15 5095376
16 9002010
17 15418728
18 25691420
19 41763900
20 66395595
21 103443144
22 158220680
23 237956160
24 352364025
25 514357740
26 740929410
27 1054227720
28 1482869934

[0,0,4,65,456,2128,7728,23607,63460,154518,347568,
 732524,1461824,2784600,5095376,9002010,15418728,
 25691420,41763900,66395595,103443144,158220680,
 237956160,352364025,514357740,740929410,
 1054227720,1482869934]

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Last modified October 22 22:14 EDT 2021. Contains 348180 sequences. (Running on oeis4.)