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A181880 as a simple table

n a(n)
0 1
1 4
2 19
3 89
4 417
5 1954
6 9156
7 42903
8 201034
9 942001
10 4414009
11 20683073
12 96916320
13 454128508
14 2127946065
15 9971086104
16 46722311119
17 218930448853
18 1025859814873
19 4806952917170
20 22524321562152
21 105544004814991
22 494555936863590
23 2317380083461485
24 10858732149251701
25 50881624784254849
26 238420075668235984
27 1117183909174960184
28 5234877488488803537
29 24529481757148330684

[1,4,19,89,417,1954,9156,42903,201034,942001,
 4414009,20683073,96916320,454128508,2127946065,
 9971086104,46722311119,218930448853,1025859814873,
 4806952917170,22524321562152,105544004814991,
 494555936863590,2317380083461485,
 10858732149251701,50881624784254849,
 238420075668235984,1117183909174960184,
 5234877488488803537,24529481757148330684]

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Last modified May 18 23:58 EDT 2021. Contains 344009 sequences. (Running on oeis4.)