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A289684 as a simple table

n a(n)
0 1
1 2
2 9
3 42
4 199
5 950
6 4554
7 21884
8 105323
9 507398
10 2446022
11 11796884
12 56912838
13 274630876
14 1325431956
15 6397576888
16 30882340531
17 149084312006
18 719736965358
19 3474807470756
20 16776410481266
21 80998307687668
22 391074406408716
23 1888199373821896
24 9116752061308798

[1,2,9,42,199,950,4554,21884,105323,507398,
 2446022,11796884,56912838,274630876,1325431956,
 6397576888,30882340531,149084312006,719736965358,
 3474807470756,16776410481266,80998307687668,
 391074406408716,1888199373821896,9116752061308798]

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Last modified May 20 21:39 EDT 2022. Contains 353876 sequences. (Running on oeis4.)