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A157580 as a simple table

n a(n)
2 1
3 3
4 18
5 11970
6 1334085
7 133955073
8 9824277155
9 567625941444
10 31246085767560
11 1696086845812315
12 89452573267087437
13 4559354532659814420
14 223147765159835078290
15 10450853058701142231795
16 468478402281324084911670

[1,3,18,11970,1334085,133955073,9824277155,
 567625941444,31246085767560,1696086845812315,
 89452573267087437,4559354532659814420,
 223147765159835078290,10450853058701142231795,
 468478402281324084911670]

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Last modified May 16 02:36 EDT 2022. Contains 353687 sequences. (Running on oeis4.)