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A001168 as a simple table

n a(n)
1 1
2 2
3 6
4 19
5 63
6 216
7 760
8 2725
9 9910
10 36446
11 135268
12 505861
13 1903890
14 7204874
15 27394666
16 104592937
17 400795844
18 1540820542
19 5940738676
20 22964779660
21 88983512783
22 345532572678
23 1344372335524
24 5239988770268
25 20457802016011
26 79992676367108
27 313224032098244
28 1228088671826973

[1,2,6,19,63,216,760,2725,9910,36446,135268,
 505861,1903890,7204874,27394666,104592937,
 400795844,1540820542,5940738676,22964779660,
 88983512783,345532572678,1344372335524,
 5239988770268,20457802016011,79992676367108,
 313224032098244,1228088671826973]

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Last modified August 19 08:17 EDT 2019. Contains 326115 sequences. (Running on oeis4.)