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A255969 as a simple table

n a(n)
0 1
1 0
2 2
3 3
4 44
5 90
6 2394
7 6720
8 202544
9 1041768
10 27369000
11 170418600
12 5835999432
13 41711464080
14 1489935696144
15 14980499777880
16 519279726915840
17 5837621201012160
18 232228922844775104
19 2946339663605953920
20 122979308145781345920
21 1869847203939341074560

[1,0,2,3,44,90,2394,6720,202544,1041768,27369000,
 170418600,5835999432,41711464080,1489935696144,
 14980499777880,519279726915840,5837621201012160,
 232228922844775104,2946339663605953920,
 122979308145781345920,1869847203939341074560]

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Last modified September 15 22:10 EDT 2019. Contains 327088 sequences. (Running on oeis4.)