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A152392 as a simple table

n a(n)
0 1
1 1
2 4
3 18
4 96
5 580
6 3852
7 27678
8 212224
9 1722312
10 14685140
11 130892938
12 1214128032
13 11680325020
14 116190588780
15 1192226810430
16 12591401841664
17 136623457948048
18 1520550097621092
19 17333459861354594
20 202126167076086240
21 2408357155115241204
22 29290914934010144140
23 363292802351275750334
24 4591181653408243417344
25 59074675546178377971800
26 773355406301039296118644
27 10293777784435208488738938

[1,1,4,18,96,580,3852,27678,212224,1722312,
 14685140,130892938,1214128032,11680325020,
 116190588780,1192226810430,12591401841664,
 136623457948048,1520550097621092,
 17333459861354594,202126167076086240,
 2408357155115241204,29290914934010144140,
 363292802351275750334,4591181653408243417344,
 59074675546178377971800,773355406301039296118644,
 10293777784435208488738938]

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Last modified February 26 10:34 EST 2024. Contains 370346 sequences. (Running on oeis4.)