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A289269 as a simple table

n a(n)
1 0
2 2
3 4
4 19
5 80
6 638
7 6054
8 76692
9 1137284
10 19405244
11 370597430
12 7825459362
13 180862277352

[0,2,4,19,80,638,6054,76692,1137284,19405244,
 370597430,7825459362,180862277352]

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Last modified November 13 02:24 EST 2018. Contains 317119 sequences. (Running on oeis4.)