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A117381 as a simple table

n a(n)
0 1
1 4
2 21
3 109
4 575
5 3047
6 16192
7 86171
8 458972
9 2445825
10 13037508
11 69509558
12 370634265
13 1976421031
14 10539858413
15 56208784808
16 299766435277
17 1598704176149
18 8526238418811
19 45472594256564
20 242517996824355

[1,4,21,109,575,3047,16192,86171,458972,2445825,
 13037508,69509558,370634265,1976421031,
 10539858413,56208784808,299766435277,
 1598704176149,8526238418811,45472594256564,
 242517996824355]

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Last modified March 26 14:18 EDT 2019. Contains 321497 sequences. (Running on oeis4.)