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A246975 as a simple table

n a(n)
0 1
1 1
2 3
3 10
4 36
5 121
6 447
7 1699
8 6589
9 25914
10 103633
11 419421
12 1714463
13 7068285
14 29361629
15 122764876
16 516245009
17 2181957489
18 9264275600
19 39495666700
20 169000837410
21 725574719515
22 3124648750706
23 13493792787415
24 58422790497226
25 253547380435914
26 1102776319943605

[1,1,3,10,36,121,447,1699,6589,25914,103633,
 419421,1714463,7068285,29361629,122764876,
 516245009,2181957489,9264275600,39495666700,
 169000837410,725574719515,3124648750706,
 13493792787415,58422790497226,253547380435914,
 1102776319943605]

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Last modified January 27 16:25 EST 2022. Contains 350608 sequences. (Running on oeis4.)