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A004254 as a simple table

n a(n)
0 0
1 1
2 5
3 24
4 115
5 551
6 2640
7 12649
8 60605
9 290376
10 1391275
11 6665999
12 31938720
13 153027601
14 733199285
15 3512968824
16 16831644835
17 80645255351
18 386394631920
19 1851327904249
20 8870244889325
21 42499896542376
22 203629237822555

[0,1,5,24,115,551,2640,12649,60605,290376,1391275,
 6665999,31938720,153027601,733199285,3512968824,
 16831644835,80645255351,386394631920,
 1851327904249,8870244889325,42499896542376,
 203629237822555]

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Last modified December 3 20:40 EST 2016. Contains 278745 sequences.