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A221511 as a simple table

n a(n)
1 0
2 3
3 7
4 36
5 130
6 532
7 2088
8 8304
9 32876
10 130376
11 516704
12 2048264
13 8118864
14 32182256
15 127565600
16 505652480
17 2004334368
18 7944899296
19 31492457536
20 124831656000
21 494815052864
22 1961376994048
23 7774621408896
24 30817501320448
25 122156223100160

[0,3,7,36,130,532,2088,8304,32876,130376,516704,
 2048264,8118864,32182256,127565600,505652480,
 2004334368,7944899296,31492457536,124831656000,
 494815052864,1961376994048,7774621408896,
 30817501320448,122156223100160]

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Last modified December 16 04:22 EST 2019. Contains 330013 sequences. (Running on oeis4.)