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A004303 as a simple table

n a(n)
1 1
2 1
3 1
4 1
5 3
6 16
7 75
8 309
9 1183
10 4360
11 15783
12 56750
13 203929
14 734722
15 2658071
16 9662093
17 35292151
18 129513736
19 477376575
20 1766738922
21 6563071865
22 24464169890
23 91478369359
24 343051225066
25 1289887370133
26 4861912847046
27 18367285963315
28 69533416698304

[1,1,1,1,3,16,75,309,1183,4360,15783,56750,203929,
 734722,2658071,9662093,35292151,129513736,
 477376575,1766738922,6563071865,24464169890,
 91478369359,343051225066,1289887370133,
 4861912847046,18367285963315,69533416698304]

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Last modified May 11 07:10 EDT 2024. Contains 372388 sequences. (Running on oeis4.)