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A219405 as a simple table

n a(n)
1 4
2 28
3 181
4 1180
5 7687
6 50077
7 326233
8 2125270
9 13845268
10 90196219
11 587591326
12 3827916001
13 24937299865
14 162456261409
15 1058335787620
16 6894622770400
17 44915634248581
18 292606900638904
19 1906213721217931
20 12418199102692513

[4,28,181,1180,7687,50077,326233,2125270,13845268,
 90196219,587591326,3827916001,24937299865,
 162456261409,1058335787620,6894622770400,
 44915634248581,292606900638904,1906213721217931,
 12418199102692513]

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Last modified April 19 19:02 EDT 2024. Contains 371798 sequences. (Running on oeis4.)