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A003319 as a simple table

n a(n)
0 0
1 1
2 1
3 3
4 13
5 71
6 461
7 3447
8 29093
9 273343
10 2829325
11 31998903
12 392743957
13 5201061455
14 73943424413
15 1123596277863
16 18176728317413
17 311951144828863
18 5661698774848621
19 108355864447215063
20 2181096921557783605
21 46066653228356851631
22 1018705098450570562877

[0,1,1,3,13,71,461,3447,29093,273343,2829325,
 31998903,392743957,5201061455,73943424413,
 1123596277863,18176728317413,311951144828863,
 5661698774848621,108355864447215063,
 2181096921557783605,46066653228356851631,
 1018705098450570562877]

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Last modified February 15 16:53 EST 2019. Contains 320136 sequences. (Running on oeis4.)