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A248873 as a simple table

n a(n)
0 1
1 4
2 12
3 34
4 93
5 255
6 693
7 1884
8 5122
9 13923
10 37847
11 102880
12 279658
13 760190
14 2066413
15 5617093
16 15268842
17 41505016
18 112822331
19 306682894
20 833650539
21 2266097111
22 6159890600
23 16744318683
24 45515777207
25 123724710091
26 336318631172
27 914208823689
28 2485077232852
29 6755140284380

[1,4,12,34,93,255,693,1884,5122,13923,37847,
 102880,279658,760190,2066413,5617093,15268842,
 41505016,112822331,306682894,833650539,2266097111,
 6159890600,16744318683,45515777207,123724710091,
 336318631172,914208823689,2485077232852,
 6755140284380]

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Last modified February 26 17:19 EST 2020. Contains 332293 sequences. (Running on oeis4.)