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A007460 as a simple table

n a(n)
0 1
1 1
2 2
3 7
4 20
5 58
6 174
7 519
8 1550
9 4634
10 13884
11 41616
12 124824
13 374390
14 1123288
15 3369297
16 10107324
17 30320434
18 90961626
19 272878138
20 818632094
21 2455888346
22 7367661682
23 22102935920
24 66308767426
25 198926187730
26 596778527246
27 1790335274112
28 5371006016314

[1,1,2,7,20,58,174,519,1550,4634,13884,41616,
 124824,374390,1123288,3369297,10107324,30320434,
 90961626,272878138,818632094,2455888346,
 7367661682,22102935920,66308767426,198926187730,
 596778527246,1790335274112,5371006016314]

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Last modified April 5 03:52 EDT 2020. Contains 333238 sequences. (Running on oeis4.)