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A221205 as a simple table

n a(n)
0 0
1 2
2 5
3 13
4 35
5 98
6 280
7 815
8 2400
9 7131
10 21332
11 64172
12 193928
13 588273
14 1790235
15 5463018
16 16710426
17 51220671
18 157289397
19 483795067
20 1490241458
21 4596440959
22 14193917243
23 43878472986
24 135777758736

[0,2,5,13,35,98,280,815,2400,7131,21332,64172,
 193928,588273,1790235,5463018,16710426,51220671,
 157289397,483795067,1490241458,4596440959,
 14193917243,43878472986,135777758736]

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Last modified May 25 11:17 EDT 2019. Contains 323539 sequences. (Running on oeis4.)