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A257178 as a simple table

n a(n)
0 1
1 3
2 10
3 33
4 110
5 369
6 1247
7 4245
8 14558
9 50295
10 175029
11 613467
12 2165100
13 7692345
14 27504600
15 98941185
16 357952580
17 1301960925
18 4759282415
19 17478557925
20 64468072820
21 238736987535
22 887359113700
23 3309489922743
24 12381998910700
25 46460457776739

[1,3,10,33,110,369,1247,4245,14558,50295,175029,
 613467,2165100,7692345,27504600,98941185,
 357952580,1301960925,4759282415,17478557925,
 64468072820,238736987535,887359113700,
 3309489922743,12381998910700,46460457776739]

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Last modified June 18 17:18 EDT 2021. Contains 345120 sequences. (Running on oeis4.)