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A111308 as a simple table

n a(n)
0 0
1 1
2 4
3 10
4 28
5 71
6 204
7 556
8 1716
9 5049
10 16884
11 53418
12 193500
13 654639
14 2560140
15 9209016
16 38697300
17 147193425
18 661035060
19 2645445870
20 12627252540
21 52926443415
22 267088884300
23 1167777120420
24 6200158778100
25 28178714373705

[0,1,4,10,28,71,204,556,1716,5049,16884,53418,
 193500,654639,2560140,9209016,38697300,147193425,
 661035060,2645445870,12627252540,52926443415,
 267088884300,1167777120420,6200158778100,
 28178714373705]

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Last modified February 27 03:50 EST 2020. Contains 332299 sequences. (Running on oeis4.)