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A277407 as a simple table

n a(n)
0 1
1 1
2 3
3 19
4 220
5 4196
6 120876
7 4915212
8 268194816
9 18903020544
10 1671209210880
11 181064295924480
12 23589442167333120
13 3638090042721918720
14 655483159341216541440
15 136420837710333144595200
16 32478481518550347674419200
17 8770206330674425311097651200
18 2666047809138871800854163456000
19 906320525390421790143785781657600
20 342508343836409428996994343026688000

[1,1,3,19,220,4196,120876,4915212,268194816,
 18903020544,1671209210880,181064295924480,
 23589442167333120,3638090042721918720,
 655483159341216541440,136420837710333144595200,
 32478481518550347674419200,
 8770206330674425311097651200,
 2666047809138871800854163456000,
 906320525390421790143785781657600,
 342508343836409428996994343026688000]

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Last modified March 28 16:34 EDT 2024. Contains 371254 sequences. (Running on oeis4.)