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A009542 as a simple table

n a(n)
0 0
1 1
2 2
3 2
4 4
5 16
6 38
7 104
8 456
9 1600
10 6154
11 29952
12 131660
13 644736
14 3516334
15 18383616
16 106736272
17 645554176
18 3902982930
19 25645936640
20 170222268308
21 1160636121088
22 8352824699446
23 60217271582720
24 450765801976408

[0,1,2,2,4,16,38,104,456,1600,6154,29952,131660,
 644736,3516334,18383616,106736272,645554176,
 3902982930,25645936640,170222268308,1160636121088,
 8352824699446,60217271582720,450765801976408]

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Last modified April 25 05:18 EDT 2024. Contains 371964 sequences. (Running on oeis4.)