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A115219 as a simple table

n a(n)
0 0
1 0
2 2
3 4
4 8
5 20
6 52
7 132
8 332
9 836
10 2108
11 5316
12 13404
13 33796
14 85212
15 214852
16 541724
17 1365892
18 3443932
19 8683460
20 21894300
21 55203844
22 139189852
23 350950468
24 884879388
25 2231116932
26 5625492956
27 14184003780
28 35763259292
29 90172756228
30 227359757660

[0,0,2,4,8,20,52,132,332,836,2108,5316,13404,
 33796,85212,214852,541724,1365892,3443932,8683460,
 21894300,55203844,139189852,350950468,884879388,
 2231116932,5625492956,14184003780,35763259292,
 90172756228,227359757660]

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Last modified May 11 03:49 EDT 2021. Contains 343784 sequences. (Running on oeis4.)