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A054389 as a simple table

n a(n)
0 1
1 20
2 140
3 620
4 2016
5 5364
6 12292
7 25228
8 47488
9 83508
10 138908
11 220748
12 337568
13 499668
14 719124
15 1010092
16 1388800
17 1873876
18 2486316
19 3249836
20 4190816
21 5338676
22 6725796
23 8387916
24 10364032
25 12696820
26 15432508
27 18621324
28 22317344
29 26578964
30 31468724
31 37053804

[1,20,140,620,2016,5364,12292,25228,47488,83508,
 138908,220748,337568,499668,719124,1010092,
 1388800,1873876,2486316,3249836,4190816,5338676,
 6725796,8387916,10364032,12696820,15432508,
 18621324,22317344,26578964,31468724,37053804]

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Last modified July 22 10:03 EDT 2019. Contains 325219 sequences. (Running on oeis4.)