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A281950 as a simple table

n a(n)
1 4
2 30
3 133
4 587
5 2559
6 11251
7 49293
8 216274
9 948407
10 4159753
11 18243646
12 80014078
13 350927303
14 1539109339
15 6750270615
16 29605549628
17 129844926004
18 569477896562
19 2497633716174
20 10954199079473
21 48043264384017
22 210709631957358

[4,30,133,587,2559,11251,49293,216274,948407,
 4159753,18243646,80014078,350927303,1539109339,
 6750270615,29605549628,129844926004,569477896562,
 2497633716174,10954199079473,48043264384017,
 210709631957358]

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Last modified September 17 19:58 EDT 2021. Contains 347489 sequences. (Running on oeis4.)