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A230556 as a simple table

n a(n)
0 1
1 1
2 2
3 4
4 9
5 21
6 51
7 128
8 327
9 858
10 2272
11 6146
12 16716
13 46246
14 128414
15 361493
16 1020506
17 2913060
18 8335405
19 24067930
20 69646035

[1,1,2,4,9,21,51,128,327,858,2272,6146,16716,
 46246,128414,361493,1020506,2913060,8335405,
 24067930,69646035]

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Last modified October 15 19:24 EDT 2018. Contains 316237 sequences. (Running on oeis4.)