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A267240 as a simple table

n a(n)
1 4
2 13
3 42
4 141
5 486
6 1685
7 5804
8 19769
9 66544
10 221581
11 730918
12 2391717
13 7772610
14 25110933
15 80713016
16 258280817
17 823269116
18 2615088973
19 8281113730
20 26150883901
21 82375282494
22 258893742933
23 811984918692
24 2541865829801
25 7943330715176

[4,13,42,141,486,1685,5804,19769,66544,221581,
 730918,2391717,7772610,25110933,80713016,
 258280817,823269116,2615088973,8281113730,
 26150883901,82375282494,258893742933,811984918692,
 2541865829801,7943330715176]

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Last modified August 9 02:14 EDT 2020. Contains 336310 sequences. (Running on oeis4.)