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A189690 as a simple table

n a(n)
1 8
2 64
3 292
4 1298
5 5172
6 20316
7 77752
8 295720
9 1117080
10 4209924
11 15835990
12 59521532
13 223600028
14 839772726
15 3153450118
16 11840705184
17 44458053838
18 166922053694
19 626717259422
20 2353026409758
21 8834468527674
22 33169066709822
23 124533341936372

[8,64,292,1298,5172,20316,77752,295720,1117080,
 4209924,15835990,59521532,223600028,839772726,
 3153450118,11840705184,44458053838,166922053694,
 626717259422,2353026409758,8834468527674,
 33169066709822,124533341936372]

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Last modified November 26 12:23 EST 2014. Contains 250067 sequences.