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A180189 as a simple table

n a(n)
1 0
2 2
3 0
4 12
5 40
6 270
7 1848
8 14840
9 133488
10 1334970
11 14684560
12 176214852
13 2290792920
14 32071101062
15 481066515720
16 7697064251760
17 130850092279648
18 2355301661033970
19 44750731559645088
20 895014631192902140

[0,2,0,12,40,270,1848,14840,133488,1334970,
 14684560,176214852,2290792920,32071101062,
 481066515720,7697064251760,130850092279648,
 2355301661033970,44750731559645088,
 895014631192902140]

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Last modified June 19 05:33 EDT 2019. Contains 324218 sequences. (Running on oeis4.)