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A204521 as a simple table

n a(n)
1 0
2 0
3 0
4 1
5 3
6 4
7 8
8 21
9 55
10 72
11 144
12 377
13 987
14 1292
15 2584
16 6765
17 17711
18 23184
19 46368
20 121393
21 317811
22 416020
23 832040
24 2178309
25 5702887
26 7465176

[0,0,0,1,3,4,8,21,55,72,144,377,987,1292,2584,
 6765,17711,23184,46368,121393,317811,416020,
 832040,2178309,5702887,7465176]

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Last modified May 26 17:02 EDT 2020. Contains 334630 sequences. (Running on oeis4.)