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A274203 as a simple table

n a(n)
0 0
1 1
2 2
3 7
4 21
5 67
6 212
7 673
8 2136
9 6781
10 21527
11 68341
12 216960
13 688777
14 2186642
15 6941875
16 22038189
17 69964063
18 222113084
19 705136609
20 2238578784
21 7106757625
22 22561637903
23 71625842857
24 227388693456
25 721884948913
26 2291749301810
27 7275556680127
28 23097519856965
29 73327093306843
30 232789608846644

[0,1,2,7,21,67,212,673,2136,6781,21527,68341,
 216960,688777,2186642,6941875,22038189,69964063,
 222113084,705136609,2238578784,7106757625,
 22561637903,71625842857,227388693456,721884948913,
 2291749301810,7275556680127,23097519856965,
 73327093306843,232789608846644]

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Last modified October 13 20:38 EDT 2019. Contains 327981 sequences. (Running on oeis4.)