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A006885 as a simple table

n a(n)
1 1
2 2
3 16
4 52
5 160
6 9232
7 13120
8 39364
9 41524
10 250504
11 1276936
12 6810136
13 8153620
14 27114424
15 50143264
16 106358020
17 121012864
18 593279152
19 1570824736
20 2482111348
21 2798323360
22 17202377752
23 24648077896
24 52483285312
25 56991483520
26 90239155648
27 139646736808

[1,2,16,52,160,9232,13120,39364,41524,250504,
 1276936,6810136,8153620,27114424,50143264,
 106358020,121012864,593279152,1570824736,
 2482111348,2798323360,17202377752,24648077896,
 52483285312,56991483520,90239155648,139646736808]

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Last modified September 16 02:16 EDT 2019. Contains 327088 sequences. (Running on oeis4.)