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A154731 as a simple table

n a(n)
1 4
2 18
3 180
4 2028
5 8820
6 34848
7 108288
8 191748
9 720900
10 875520
11 960498
12 990000
13 1355310
14 1629108
15 1713600
16 1756920
17 2334948
18 2609028
19 7376850
20 8448048
21 21639798
22 37148148
23 42023088
24 48893940
25 60544008
26 63840000
27 100328400

[4,18,180,2028,8820,34848,108288,191748,720900,
 875520,960498,990000,1355310,1629108,1713600,
 1756920,2334948,2609028,7376850,8448048,21639798,
 37148148,42023088,48893940,60544008,63840000,
 100328400]

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Last modified October 16 15:51 EDT 2019. Contains 328101 sequences. (Running on oeis4.)