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A077997 as a simple table

n a(n)
0 1
1 1
2 3
3 8
4 20
5 51
6 130
7 331
8 843
9 2147
10 5468
11 13926
12 35467
13 90328
14 230049
15 585893
16 1492163
17 3800268
18 9678592
19 24649615
20 62778090
21 159884387
22 407196479
23 1037055435
24 2641191736
25 6726635386
26 17131517943
27 43630863008
28 111119879345
29 283002139641
30 720755021635

[1,1,3,8,20,51,130,331,843,2147,5468,13926,35467,
 90328,230049,585893,1492163,3800268,9678592,
 24649615,62778090,159884387,407196479,1037055435,
 2641191736,6726635386,17131517943,43630863008,
 111119879345,283002139641,720755021635]

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Last modified September 25 00:48 EDT 2020. Contains 337333 sequences. (Running on oeis4.)