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A000245 as a simple table

n a(n)
0 0
1 1
2 3
3 9
4 28
5 90
6 297
7 1001
8 3432
9 11934
10 41990
11 149226
12 534888
13 1931540
14 7020405
15 25662825
16 94287120
17 347993910
18 1289624490
19 4796857230
20 17902146600
21 67016296620
22 251577050010
23 946844533674
24 3572042254128
25 13505406670700
26 51166197843852
27 194214400834356

[0,1,3,9,28,90,297,1001,3432,11934,41990,149226,
 534888,1931540,7020405,25662825,94287120,
 347993910,1289624490,4796857230,17902146600,
 67016296620,251577050010,946844533674,
 3572042254128,13505406670700,51166197843852,
 194214400834356]

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Last modified October 21 12:53 EDT 2018. Contains 316422 sequences. (Running on oeis4.)