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A104629 as a simple table

n a(n)
0 1
1 2
2 6
3 18
4 57
5 186
6 622
7 2120
8 7338
9 25724
10 91144
11 325878
12 1174281
13 4260282
14 15548694
15 57048048
16 210295326
17 778483932
18 2892818244
19 10786724388
20 40347919626
21 151355847012
22 569274150156
23 2146336125648
24 8110508473252

[1,2,6,18,57,186,622,2120,7338,25724,91144,325878,
 1174281,4260282,15548694,57048048,210295326,
 778483932,2892818244,10786724388,40347919626,
 151355847012,569274150156,2146336125648,
 8110508473252]

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Last modified March 18 19:58 EDT 2019. Contains 321293 sequences. (Running on oeis4.)