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A178345 as a simple table

n a(n)
0 1
1 3
2 15
3 70
4 630
5 2772
6 48048
7 205920
8 3500640
9 29560960
10 496624128
11 2076791808
12 138452787200
13 575111577600
14 9530420428800
15 157569617756160
16 5199797385953280
17 21410930412748800
18 1408363422705254400

[1,3,15,70,630,2772,48048,205920,3500640,29560960,
 496624128,2076791808,138452787200,575111577600,
 9530420428800,157569617756160,5199797385953280,
 21410930412748800,1408363422705254400]

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Last modified November 13 15:41 EST 2019. Contains 329106 sequences. (Running on oeis4.)