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A154626 as a simple table

n a(n)
0 1
1 2
2 8
3 40
4 208
5 1088
6 5696
7 29824
8 156160
9 817664
10 4281344
11 22417408
12 117379072
13 614604800
14 3218112512
15 16850255872
16 88229085184
17 461973487616
18 2418924584960
19 12665653559296
20 66318223015936
21 347246723858432
22 1818207451086848
23 9520257811087360

[1,2,8,40,208,1088,5696,29824,156160,817664,
 4281344,22417408,117379072,614604800,3218112512,
 16850255872,88229085184,461973487616,
 2418924584960,12665653559296,66318223015936,
 347246723858432,1818207451086848,9520257811087360]

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Last modified March 31 03:48 EDT 2020. Contains 333136 sequences. (Running on oeis4.)