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A309901 as a simple table

n a(n)
0 0
1 1
2 7
3 25
4 52
5 52
6 538
7 1267
8 1267
9 1267
10 20950
11 20950
12 198097
13 1260979
14 1260979
15 6043948
16 6043948
17 92137390
18 92137390
19 866978368
20 2029239835
21 5516024236
22 26436730642
23 57817790251
24 246104147905
25 810963220867
26 1658251830310
27 6741983486968
28 21993178456942

[0,1,7,25,52,52,538,1267,1267,1267,20950,20950,
 198097,1260979,1260979,6043948,6043948,92137390,
 92137390,866978368,2029239835,5516024236,
 26436730642,57817790251,246104147905,810963220867,
 1658251830310,6741983486968,21993178456942]

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Last modified August 5 11:48 EDT 2021. Contains 346467 sequences. (Running on oeis4.)