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A219137 as a simple table

n a(n)
1 4
2 18
3 78
4 331
5 1400
6 5949
7 25277
8 107353
9 455938
10 1936500
11 8224877
12 34933256
13 148370893
14 630171269
15 2676507659
16 11367850562
17 48282330086
18 205068091043
19 870979546682
20 3699285278069
21 15711863292777
22 66732525229601

[4,18,78,331,1400,5949,25277,107353,455938,
 1936500,8224877,34933256,148370893,630171269,
 2676507659,11367850562,48282330086,205068091043,
 870979546682,3699285278069,15711863292777,
 66732525229601]

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Last modified February 5 22:19 EST 2023. Contains 360087 sequences. (Running on oeis4.)