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A175005 as a simple table

n a(n)
0 0
1 1
2 4
3 13
4 42
5 137
6 448
7 1465
8 4790
9 15661
10 51204
11 167413
12 547362
13 1789617
14 5851208
15 19130705
16 62548430
17 204504021
18 668632204
19 2186113613
20 7147565882
21 23369187097
22 76406277968
23 249812682345
24 816770269670
25 2670455587581

[0,1,4,13,42,137,448,1465,4790,15661,51204,167413,
 547362,1789617,5851208,19130705,62548430,
 204504021,668632204,2186113613,7147565882,
 23369187097,76406277968,249812682345,816770269670,
 2670455587581]

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Last modified July 12 21:31 EDT 2020. Contains 335669 sequences. (Running on oeis4.)