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A190339 as a simple table

n a(n)
0 2
1 6
2 15
3 105
4 105
5 231
6 15015
7 2145
8 36465
9 969969
10 4849845
11 10140585
12 10140585
13 22287
14 3231615
15 7713865005
16 7713865005
17 90751353
18 218257003965
19 1641030105
20 67282234305
21 368217318651
22 1841086593255

[2,6,15,105,105,231,15015,2145,36465,969969,
 4849845,10140585,10140585,22287,3231615,
 7713865005,7713865005,90751353,218257003965,
 1641030105,67282234305,368217318651,1841086593255]

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Last modified October 16 18:03 EDT 2019. Contains 328102 sequences. (Running on oeis4.)