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A218274 as a simple table

n a(n)
0 0
1 1
2 4
3 27
4 168
5 1140
6 7800
7 54845
8 390320
9 2815344
10 20494320
11 150442908
12 1111782672
13 8264558016
14 61743361680
15 463306724595
16 3489942222624
17 26378657835816
18 199991245341888
19 1520403553182800
20 11587257160313120
21 88506896001503616
22 677426230547667744

[0,1,4,27,168,1140,7800,54845,390320,2815344,
 20494320,150442908,1111782672,8264558016,
 61743361680,463306724595,3489942222624,
 26378657835816,199991245341888,1520403553182800,
 11587257160313120,88506896001503616,
 677426230547667744]

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Last modified July 19 06:32 EDT 2024. Contains 374389 sequences. (Running on oeis4.)