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A356667 as a simple table

n a(n)
0 1
1 1
2 4
3 12
4 72
5 240
6 2520
7 10080
8 127680
9 816480
10 11037600
11 79833600
12 1514177280
13 12454041600
14 261655954560
15 2699348652000
16 62869385779200
17 711374856192000
18 19407798693803520
19 243290200817664000
20 7300765959334848000
21 102980278869910041600

[1,1,4,12,72,240,2520,10080,127680,816480,
 11037600,79833600,1514177280,12454041600,
 261655954560,2699348652000,62869385779200,
 711374856192000,19407798693803520,
 243290200817664000,7300765959334848000,
 102980278869910041600]

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Last modified August 15 00:19 EDT 2024. Contains 375171 sequences. (Running on oeis4.)