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A038733 as a simple table

n a(n)
4 1
5 10
6 57
7 245
8 888
9 2881
10 8679
11 24872
12 68940
13 186953
14 499927
15 1325204
16 3494249
17 9184675
18 24098536
19 63165197
20 165471668
21 433350754
22 1134715190
23 2970971916
24 7778430788
25 20364616458
26 53315795326
27 139583244540

[1,10,57,245,888,2881,8679,24872,68940,186953,
 499927,1325204,3494249,9184675,24098536,63165197,
 165471668,433350754,1134715190,2970971916,
 7778430788,20364616458,53315795326,139583244540]

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Last modified February 16 12:48 EST 2019. Contains 320163 sequences. (Running on oeis4.)