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A224488 as a simple table

n a(n)
1 4
2 10
3 42
4 90
5 2448
6 4680
7 27144
8 117000
9 154498509
10 222970077
11 11049088050
12 63554826816 

[4,10,42,90,2448,4680,27144,117000,154498509,
 222970077,11049088050,63554826816]

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Last modified April 16 00:00 EDT 2024. Contains 371696 sequences. (Running on oeis4.)