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A042707 as a simple table

n a(n)
0 1
1 1
2 3
3 4
4 7
5 137
6 555
7 2912
8 18027
9 38966
10 95959
11 230884
12 326843
13 884570
14 1211413
15 2095983
16 5403379
17 45323015
18 413310514
19 458633529
20 1789211101
21 2247844630
22 6284900361
23 184509955099
24 375304810559
25 559814765658
26 2054749107533
27 2614563873191
28 25585823966252

[1,1,3,4,7,137,555,2912,18027,38966,95959,230884,
 326843,884570,1211413,2095983,5403379,45323015,
 413310514,458633529,1789211101,2247844630,
 6284900361,184509955099,375304810559,559814765658,
 2054749107533,2614563873191,25585823966252]

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Last modified March 25 01:17 EDT 2019. Contains 321450 sequences. (Running on oeis4.)