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A068875 as a simple table

n a(n)
0 1
1 2
2 4
3 10
4 28
5 84
6 264
7 858
8 2860
9 9724
10 33592
11 117572
12 416024
13 1485800
14 5348880
15 19389690
16 70715340
17 259289580
18 955277400
19 3534526380
20 13128240840
21 48932534040
22 182965127280
23 686119227300
24 2579808294648
25 9723892802904

[1,2,4,10,28,84,264,858,2860,9724,33592,117572,
 416024,1485800,5348880,19389690,70715340,
 259289580,955277400,3534526380,13128240840,
 48932534040,182965127280,686119227300,
 2579808294648,9723892802904]

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Last modified October 17 18:19 EDT 2018. Contains 316292 sequences. (Running on oeis4.)