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A153923 as a simple table

n a(n)
0 1
1 2
2 723
3 3847
4 12686
5 64066
6 522788
7 2375205
8 17429033
9 207659953
10 1416380562
11 15388271829
12 267002004687
13 2673537774503
14 42803194029689
15 1082510269366192

[1,2,723,3847,12686,64066,522788,2375205,17429033,
 207659953,1416380562,15388271829,267002004687,
 2673537774503,42803194029689,1082510269366192]

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Last modified February 20 11:01 EST 2020. Contains 332073 sequences. (Running on oeis4.)