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A102307 as a simple table

n a(n)
0 1
1 4
2 30
3 260
4 2380
5 22428
6 215292
7 2093520
8 20553390
9 203280220
10 2022339176
11 20215564824
12 202879303900
13 2042865050800
14 20629119101400
15 208829908532880
16 2118554718825420
17 21533269718832300
18 219235457827640100
19 2235446059461106800
20 22824647678376163620
21 233331794241184490280

[1,4,30,260,2380,22428,215292,2093520,20553390,
 203280220,2022339176,20215564824,202879303900,
 2042865050800,20629119101400,208829908532880,
 2118554718825420,21533269718832300,
 219235457827640100,2235446059461106800,
 22824647678376163620,233331794241184490280]

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Last modified April 24 22:17 EDT 2024. Contains 371964 sequences. (Running on oeis4.)