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A072547 as a simple table

n a(n)
1 1
2 0
3 2
4 6
5 22
6 80
7 296
8 1106
9 4166
10 15792
11 60172
12 230252
13 884236
14 3406104
15 13154948
16 50922986
17 197519942
18 767502944
19 2987013068
20 11641557716
21 45429853652
22 177490745984
23 694175171648
24 2717578296116
25 10648297329692
26 41757352712480

[1,0,2,6,22,80,296,1106,4166,15792,60172,230252,
 884236,3406104,13154948,50922986,197519942,
 767502944,2987013068,11641557716,45429853652,
 177490745984,694175171648,2717578296116,
 10648297329692,41757352712480]

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Last modified December 11 21:21 EST 2019. Contains 329937 sequences. (Running on oeis4.)