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A068764 as a simple table

n a(n)
0 1
1 1
2 4
3 18
4 88
5 456
6 2464
7 13736
8 78432
9 456416
10 2697088
11 16141120
12 97632000
13 595912960
14 3665728512
15 22703097472
16 141448381952
17 885934151168
18 5575020435456
19 35230798994432
20 223485795258368
21 1422572226146304
22 9083682419818496
23 58169612565614592
24 373486362257899520
25 2403850703479816192

[1,1,4,18,88,456,2464,13736,78432,456416,2697088,
 16141120,97632000,595912960,3665728512,
 22703097472,141448381952,885934151168,
 5575020435456,35230798994432,223485795258368,
 1422572226146304,9083682419818496,
 58169612565614592,373486362257899520,
 2403850703479816192]

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Last modified October 22 09:57 EDT 2018. Contains 316433 sequences. (Running on oeis4.)