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A229638 as a simple table

n a(n)
1 0
2 6
3 40
4 122
5 488
6 1608
7 5392
8 17368
9 55232
10 172896
11 535296
12 1641376
13 4992896
14 15083648
15 45297408
16 135323008
17 402405376
18 1191699968
19 3516119040
20 10339711488
21 30313351168
22 88624646144
23 258445856768
24 751910639616
25 2182836600832

[0,6,40,122,488,1608,5392,17368,55232,172896,
 535296,1641376,4992896,15083648,45297408,
 135323008,402405376,1191699968,3516119040,
 10339711488,30313351168,88624646144,258445856768,
 751910639616,2182836600832]

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Last modified February 26 08:15 EST 2020. Contains 332277 sequences. (Running on oeis4.)