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A003080 as a simple table

n a(n)
0 1
1 1
2 2
3 5
4 13
5 37
6 111
7 345
8 1105
9 3624
10 12099
11 41000
12 140647
13 487440
14 1704115
15 6002600
16 21282235
17 75890812
18 272000538
19 979310627
20 3540297130
21 12845634348
22 46764904745
23 170767429511
24 625314778963
25 2295635155206
26 8447553316546
27 31153444946778
28 115122389065883

[1,1,2,5,13,37,111,345,1105,3624,12099,41000,
 140647,487440,1704115,6002600,21282235,75890812,
 272000538,979310627,3540297130,12845634348,
 46764904745,170767429511,625314778963,
 2295635155206,8447553316546,31153444946778,
 115122389065883]

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Last modified February 22 09:55 EST 2019. Contains 320390 sequences. (Running on oeis4.)