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A335318 as a simple table

n a(n)
1 1
2 6
3 140
4 270
5 672
6 8190
7 30240
8 332640
9 14303520
10 17428320
11 27027000
12 191711520
13 2144862720
14 3506025600
15 5943057120
16 14378364000
17 45578332800
18 288662774400
19 505159855200
20 2020639420800
21 10680522652800
22 54557264361600

[1,6,140,270,672,8190,30240,332640,14303520,
 17428320,27027000,191711520,2144862720,3506025600,
 5943057120,14378364000,45578332800,288662774400,
 505159855200,2020639420800,10680522652800,
 54557264361600]

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Last modified July 27 20:33 EDT 2021. Contains 346308 sequences. (Running on oeis4.)