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A219422 as a simple table

n a(n)
1 1
2 7
3 20
4 57
5 160
6 454
7 1292
8 3676
9 10452
10 29724
11 84548
12 240480
13 683968
14 1945348
15 5533040
16 15737260
17 44760324
18 127308564
19 362094824
20 1029880752
21 2929216636
22 8331363064
23 23696305892
24 67397723860
25 191694568548
26 545223274608

[1,7,20,57,160,454,1292,3676,10452,29724,84548,
 240480,683968,1945348,5533040,15737260,44760324,
 127308564,362094824,1029880752,2929216636,
 8331363064,23696305892,67397723860,191694568548,
 545223274608]

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Last modified May 22 20:08 EDT 2022. Contains 353957 sequences. (Running on oeis4.)