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A056288 as a simple table

n a(n)
1 0
2 0
3 2
4 9
5 30
6 89
7 258
8 720
9 2016
10 5583
11 15546
12 43215
13 120750
14 338001
15 950030
16 2677770
17 7573350
18 21478632
19 61088874
20 174179133
21 497812378
22 1425832077
23 4092087522
24 11765778330
25 33887517840
26 97756266615
27 282414622728
28 816999371955
29 2366509198350
30 6862929885407

[0,0,2,9,30,89,258,720,2016,5583,15546,43215,
 120750,338001,950030,2677770,7573350,21478632,
 61088874,174179133,497812378,1425832077,
 4092087522,11765778330,33887517840,97756266615,
 282414622728,816999371955,2366509198350,
 6862929885407]

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Last modified April 25 09:25 EDT 2024. Contains 371967 sequences. (Running on oeis4.)