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A006819 as a simple table

n a(n)
0 1
1 6
2 30
3 150
4 750
5 3726
6 18438
7 90966
8 447918
9 2201622
10 10809006
11 52999446
12 259668942
13 1271054982
14 6218232414
15 30399142614

[1,6,30,150,750,3726,18438,90966,447918,2201622,
 10809006,52999446,259668942,1271054982,6218232414,
 30399142614]

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Last modified February 17 19:37 EST 2019. Contains 320223 sequences. (Running on oeis4.)