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A221891 as a simple table

n a(n)
1 0
2 0
3 8
4 37
5 169
6 811
7 3878
8 18502
9 88302
10 421463
11 2011587
12 9601013
13 45824300
14 218713020
15 1043886804
16 4982326441
17 23779950797
18 113498396063
19 541712050514
20 2585516235106
21 12340309202426
22 58898578606299
23 281114719650631

[0,0,8,37,169,811,3878,18502,88302,421463,2011587,
 9601013,45824300,218713020,1043886804,4982326441,
 23779950797,113498396063,541712050514,
 2585516235106,12340309202426,58898578606299,
 281114719650631]

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Last modified August 17 00:01 EDT 2022. Contains 356180 sequences. (Running on oeis4.)