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A135867 as a simple table

n a(n)
0 1
1 1
2 4
3 36
4 640
5 21888
6 1451008
7 188941312
8 48768745472
9 25069815595008
10 25722272102744064
11 52730972085034156032
12 216091838647321476726784
13 1770657164881170759078117376
14 29013990909330956353981535748096 

[1,1,4,36,640,21888,1451008,188941312,48768745472,
 25069815595008,25722272102744064,
 52730972085034156032,216091838647321476726784,
 1770657164881170759078117376,
 29013990909330956353981535748096]

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Last modified April 20 00:03 EDT 2024. Contains 371798 sequences. (Running on oeis4.)