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A188230 as a simple table

n a(n)
1 1
2 4
3 12
4 52
5 221
6 1019
7 4818
8 23522
9 117209
10 594789
11 3062414
12 15966168
13 84132345
14 447457816
15 2399177028
16 12956403904
17 70416558196
18 384897011042
19 2114694606220
20 11672750655842
21 64705139473661
22 360068911514032
23 2010827078176568

[1,4,12,52,221,1019,4818,23522,117209,594789,
 3062414,15966168,84132345,447457816,2399177028,
 12956403904,70416558196,384897011042,
 2114694606220,11672750655842,64705139473661,
 360068911514032,2010827078176568]

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Last modified October 25 04:11 EDT 2021. Contains 348237 sequences. (Running on oeis4.)