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A053489 formatted as a simple table:

n a(n)
0 1
1 0
2 4
3 6
4 64
5 300
6 2568
7 20160
8 193856
9 1989792
10 22687200
11 279956160
12 3737966208
13 53589444480
14 821522026752
15 13407498599040
16 232106716968960
17 4248256958023680
18 81968803604600832
19 1662870215019018240
20 35384007384670648320
21 788053048823608565760

[1,0,4,6,64,300,2568,20160,193856,1989792,
 22687200,279956160,3737966208,53589444480,
 821522026752,13407498599040,232106716968960,
 4248256958023680,81968803604600832,
 1662870215019018240,35384007384670648320,
 788053048823608565760]

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Last modified December 16 13:01 EST 2009. Contains 170825 sequences.


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