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A265950 as a simple table

n a(n)
0 1
1 1
2 2
3 8
4 30
5 156
6 900
7 6192
8 47904
9 422928
10 4138848
11 44864640
12 531227520
13 6836927040
14 94891046400
15 1413494219520
16 22481104677120
17 380261238681600
18 6814832064422400
19 128991143627965440
20 2571187988206540800
21 53834676521793638400
22 1181214133296983654400

[1,1,2,8,30,156,900,6192,47904,422928,4138848,
 44864640,531227520,6836927040,94891046400,
 1413494219520,22481104677120,380261238681600,
 6814832064422400,128991143627965440,
 2571187988206540800,53834676521793638400,
 1181214133296983654400]

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Last modified May 24 20:53 EDT 2019. Contains 323534 sequences. (Running on oeis4.)