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A274579 as a simple table

n a(n)
1 0
2 1
3 7
4 27
5 540
6 2002
7 10660
8 39501
9 779247
10 2887450
11 15372280
12 56960982
13 1123674201
14 4163701465
15 22166817667
16 82137697110
17 1620337419162
18 6004054625647
19 31964535704101
20 118442502272205
21 2336525434757970
22 8657842606482076
23 46092838318496542

[0,1,7,27,540,2002,10660,39501,779247,2887450,
 15372280,56960982,1123674201,4163701465,
 22166817667,82137697110,1620337419162,
 6004054625647,31964535704101,118442502272205,
 2336525434757970,8657842606482076,
 46092838318496542]

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Last modified January 17 14:57 EST 2020. Contains 330958 sequences. (Running on oeis4.)