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A126928 as a simple table

n a(n)
0 1
1 40
2 800
3 10600
4 104360
5 813400
6 5229440
7 28562200
8 135572000
9 569558760
10 2150276800
11 7389308840
12 23367148600
13 68636533400
14 188771088160
15 489493290200
16 1203878338240
17 2822878985000
18 6339184744800
19 13687255667560
20 28512882878600
21 57481510167640

[1,40,800,10600,104360,813400,5229440,28562200,
 135572000,569558760,2150276800,7389308840,
 23367148600,68636533400,188771088160,489493290200,
 1203878338240,2822878985000,6339184744800,
 13687255667560,28512882878600,57481510167640]

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Last modified May 9 12:21 EDT 2024. Contains 372350 sequences. (Running on oeis4.)