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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
23 975646292570399
24 4674602225029440

[0,1,5,24,115,551,2640,12649,60605,290376,1391275,
 6665999,31938720,153027601,733199285,3512968824,
 16831644835,80645255351,386394631920,
 1851327904249,8870244889325,42499896542376,
 203629237822555,975646292570399,4674602225029440]

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Last modified June 24 01:31 EDT 2017. Contains 288697 sequences.