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A153294 as a simple table

n a(n)
0 1
1 1
2 4
3 18
4 86
5 427
6 2180
7 11373
8 60380
9 325259
10 1773842
11 9776637
12 54380144
13 304905223
14 1721650832
15 9782051362
16 55888463214
17 320898932595
18 1850762866662
19 10717217871255
20 62287285235230
21 363212668363520
22 2124430957852380

[1,1,4,18,86,427,2180,11373,60380,325259,1773842,
 9776637,54380144,304905223,1721650832,9782051362,
 55888463214,320898932595,1850762866662,
 10717217871255,62287285235230,363212668363520,
 2124430957852380]

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Last modified March 18 11:15 EDT 2019. Contains 321283 sequences. (Running on oeis4.)