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A215251 as a simple table

n a(n)
1 1
2 1
3 1
4 2
5 4
6 36
7 225
8 7840
9 313600
10 45302400
11 8930250000
12 8373836401920
13 9001015156742400
14 41813367543204433176
15 325385777102562972821025
16 8270190445766978650521600000
17 377177413291384771899817984000000
18 62187743659065606074696974956949929984

[1,1,1,2,4,36,225,7840,313600,45302400,8930250000,
 8373836401920,9001015156742400,
 41813367543204433176,325385777102562972821025,
 8270190445766978650521600000,
 377177413291384771899817984000000,
 62187743659065606074696974956949929984]

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Last modified April 24 00:30 EDT 2024. Contains 371917 sequences. (Running on oeis4.)