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A323971 as a simple table

n a(n)
0 1
1 15
2 155
3 1332
4 8342
5 41586
6 174844
7 642815
8 2117690
9 6362806
10 17671203
11 45844681
12 112047610
13 259796057
14 574776968
15 1219349012
16 2490738686
17 4916477305
18 9406990883
19 17494038498
20 31695618318
21 56063910644
22 96993880940
23 164397619093
24 273384891666
25 446635565576

[1,15,155,1332,8342,41586,174844,642815,2117690,
 6362806,17671203,45844681,112047610,259796057,
 574776968,1219349012,2490738686,4916477305,
 9406990883,17494038498,31695618318,56063910644,
 96993880940,164397619093,273384891666,
 446635565576]

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Last modified April 19 16:52 EDT 2019. Contains 322282 sequences. (Running on oeis4.)