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A056268 as a simple table

n a(n)
1 0
2 0
3 6
4 36
5 150
6 534
7 1806
8 5760
9 18144
10 55830
11 17100
12 6
13 518580
14 1569750
15 4732014
16 14250450
17 42844320
18 128746950
19 38661
20 5376
21 1160688606
22 3483582660
23 10454059938
24 31368305694
25 941180
26 13006
27 282378679920

[0,0,6,36,150,534,1806,5760,18144,55830,17100,6,
 518580,1569750,4732014,14250450,42844320,
 128746950,38661,5376,1160688606,3483582660,
 10454059938,31368305694,941180,13006,282378679920]

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Last modified September 28 09:35 EDT 2020. Contains 337394 sequences. (Running on oeis4.)