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A188494 as a simple table

n a(n)
0 0
1 1
2 2
3 4
4 12
5 42
6 138
7 414
8 1235
9 3764
10 11604
11 35664
12 109132
13 333652
14 1021220
15 3127709
16 9578526
17 29326904
18 89785684
19 274896606
20 841682902
21 2577075290
22 7890425175
23 24158602552
24 73968049928
25 226473538032
26 693411153800
27 2123068036904
28 6500352097064

[0,1,2,4,12,42,138,414,1235,3764,11604,35664,
 109132,333652,1021220,3127709,9578526,29326904,
 89785684,274896606,841682902,2577075290,
 7890425175,24158602552,73968049928,226473538032,
 693411153800,2123068036904,6500352097064]

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Last modified April 23 20:33 EDT 2024. Contains 371916 sequences. (Running on oeis4.)