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A318618 as a simple table

n a(n)
0 1
1 1
2 3
3 15
4 102
5 870
6 8910
7 106470
8 1454040
9 22339800
10 381364200
11 7161323400
12 146701724400
13 3255661609200
14 77808668137200
15 1992415575150000
16 54420258228336000
17 1579320261543024000
18 48529229906613456000
19 1574046971727454224000
20 53741325186841612320000

[1,1,3,15,102,870,8910,106470,1454040,22339800,
 381364200,7161323400,146701724400,3255661609200,
 77808668137200,1992415575150000,54420258228336000,
 1579320261543024000,48529229906613456000,
 1574046971727454224000,53741325186841612320000]

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Last modified July 31 08:07 EDT 2024. Contains 374774 sequences. (Running on oeis4.)