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A056283 as a simple table

n a(n)
1 0
2 0
3 2
4 9
5 30
6 91
7 258
8 729
9 2018
10 5613
11 15546
12 43315
13 120750
14 338259
15 950062
16 2678499
17 7573350
18 21480739
19 61088874
20 174184755
21 497812638
22 1425847623
23 4092087522
24 11765822365
25 33887517870
26 97756387365
27 282414624746
28 816999710223
29 2366509198350
30 6862930841141

[0,0,2,9,30,91,258,729,2018,5613,15546,43315,
 120750,338259,950062,2678499,7573350,21480739,
 61088874,174184755,497812638,1425847623,
 4092087522,11765822365,33887517870,97756387365,
 282414624746,816999710223,2366509198350,
 6862930841141]

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Last modified November 17 05:59 EST 2018. Contains 317275 sequences. (Running on oeis4.)