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A254381 as a simple table

n a(n)
0 1
1 18
2 540
3 22680
4 1224720
5 80831520
6 6304858560
7 567437270400
8 57878601580800
9 6598160580211200
10 831368233106611200
11 114728816168712345600
12 17209322425306851840000
13 2787910232899709998080000
14 485096380524549539665920000
15 90227926777566214377861120000 

[1,18,540,22680,1224720,80831520,6304858560,
 567437270400,57878601580800,6598160580211200,
 831368233106611200,114728816168712345600,
 17209322425306851840000,2787910232899709998080000,
 485096380524549539665920000,
 90227926777566214377861120000]

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Last modified May 29 00:29 EDT 2024. Contains 372921 sequences. (Running on oeis4.)