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A010931 as a simple table

n a(n)
0 1
1 15
2 105
3 455
4 1365
5 3003
6 5005
7 6435
8 6435
9 5005
10 3003
11 1365
12 455
13 105
14 15
15 1

[1,15,105,455,1365,3003,5005,6435,6435,5005,3003,
 1365,455,105,15,1]

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Last modified November 17 12:58 EST 2018. Contains 317276 sequences. (Running on oeis4.)