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A000144 as a simple table

n a(n)
0 1
1 20
2 180
3 960
4 3380
5 8424
6 16320
7 28800
8 52020
9 88660
10 129064
11 175680
12 262080
13 386920
14 489600
15 600960
16 840500
17 1137960
18 1330420
19 1563840
20 2050344
21 2611200
22 2986560
23 3358080
24 4194240
25 5318268
26 5878440
27 6299520
28 7862400
29 9619560

[1,20,180,960,3380,8424,16320,28800,52020,88660,
 129064,175680,262080,386920,489600,600960,840500,
 1137960,1330420,1563840,2050344,2611200,2986560,
 3358080,4194240,5318268,5878440,6299520,7862400,
 9619560]

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Last modified May 2 04:48 EDT 2024. Contains 372178 sequences. (Running on oeis4.)