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A148781 as a simple table

n a(n)
0 1
1 1
2 3
3 8
4 23
5 81
6 280
7 977
8 3604
9 13639
10 52495
11 204309
12 809815
13 3254081
14 13151968
15 53676309
16 221332075
17 919068872
18 3840205474
19 16141523490
20 68250278556
21 290038761654
22 1237578756865
23 5303354547855
24 22822808433377
25 98575512487716
26 427174939588696
27 1857042440689138
28 8097662637790062

[1,1,3,8,23,81,280,977,3604,13639,52495,204309,
 809815,3254081,13151968,53676309,221332075,
 919068872,3840205474,16141523490,68250278556,
 290038761654,1237578756865,5303354547855,
 22822808433377,98575512487716,427174939588696,
 1857042440689138,8097662637790062]

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Last modified May 28 05:47 EDT 2022. Contains 354112 sequences. (Running on oeis4.)