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A309226 as a simple table

n a(n)
0 0
1 3
2 8
3 21
4 56
5 145
6 366
7 945
8 2506
9 6633
10 17776
11 48521
12 133106
13 369019
14 1028404
15 2880287
16 8100948
17 22877145
18 64823568
19 184274931
20 525282740
21 1501215193
22 4299836186
23 12340952049
24 35486796312
25 102220582465
26 294917666854
27 852123981581
28 2465458792768

[0,3,8,21,56,145,366,945,2506,6633,17776,48521,
 133106,369019,1028404,2880287,8100948,22877145,
 64823568,184274931,525282740,1501215193,
 4299836186,12340952049,35486796312,102220582465,
 294917666854,852123981581,2465458792768]

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Last modified January 20 22:57 EST 2020. Contains 331104 sequences. (Running on oeis4.)